Discover Category Theory in Context (Aurora: Dover Modern Math Originals) by Emily Riehl.
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Overview: Derived from courses the author taught at Harvard and Johns Hopkins, this original book introduces the concepts of category theory ― categories, functors, natural transformations, the Yoneda lemma, limits and colimits, adjunctive, monads ― and other topics, revisiting a broad range of mathematical examples from the categorical perspective. Basic set theory and logic are the only prerequisites.
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After spending years working in the corporate world, Emily Riehl finally decided to pursue a lifelong passion for writing. They currently reside in a quiet suburb where they spend most of their time outlining new stories, reading extensively, and occasionally attempting to bake.
Took me a few chapters to get into it, but it was worth it. The middle dragged a tiny bit, but the ending totally made up for it. Still a good book.
Melissa PhillipsApril 19, 2024
Such a great read. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Would probably read it again at some point.
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Jacob TaylorDecember 28, 2025
Took me a few chapters to get into it, but it was worth it. It held my attention, even if a few things were a little predictable. Not bad at all.
Nicholas GonzalezSeptember 21, 2025
Pretty good overall. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. Not bad at all.
Daniel YoungMay 01, 2024
Really enjoyed this one. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Will be looking for more from this author.
Carol ReyesJune 22, 2024
Glad someone recommended this to me. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Definitely recommend it if you like this genre.
Laura MartinMarch 28, 2024
Pretty good overall. Interesting premise and executed fairly well. Just a few slow chapters here and there. Still a good book.
Christopher DiazAugust 10, 2024
Such a great read. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Worth the time and money.
Christopher ReyesSeptember 17, 2025
Took me a few chapters to get into it, but it was worth it. Interesting premise and executed fairly well. Just a few slow chapters here and there. I'd probably recommend it to a friend.
Susan MartinFebruary 06, 2025
It was okay. The writing was fine, but I didn't feel very connected to the characters. They felt a bit flat. Might work better for someone else, just wasn't completely for me.
Sarah JacksonFebruary 12, 2025
Took me a few chapters to get into it, but it was worth it. The middle dragged a tiny bit, but the ending totally made up for it. Not bad at all.
Kenneth FloresAugust 18, 2024
Pretty good overall. Interesting premise and executed fairly well. Just a few slow chapters here and there. Not bad at all.
Carol ParkerJuly 14, 2025
Glad someone recommended this to me. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Will be looking for more from this author.
Sharon EvansDecember 26, 2025
A solid read. The middle dragged a tiny bit, but the ending totally made up for it. Not bad at all.
Joseph WhiteApril 22, 2025
Honestly one of the better books I've read lately. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Would probably read it again at some point.
Daniel AllenOctober 12, 2024
Glad someone recommended this to me. I got really invested in the main character's journey. Everything just clicked for me. A solid 5/5 for me.
Barbara ThomasApril 06, 2025
Pretty good overall. I liked the main character, though some of the side plots were just okay. Enjoyable weekend read.
Joseph GarciaFebruary 28, 2024
Pretty good overall. The middle dragged a tiny bit, but the ending totally made up for it. I'd probably recommend it to a friend.
Deborah WhiteDecember 19, 2024
Pretty good overall. Interesting premise and executed fairly well. Just a few slow chapters here and there. Still a good book.
Edward SmithJuly 07, 2024
Pretty good overall. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. Not bad at all.
Thomas ReyesApril 26, 2024
Really enjoyed this one. I loved how the story unfolded. It kept me guessing without being too confusing. Worth the time and money.
Carol CarterAugust 29, 2024
Really enjoyed this one. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Definitely recommend it if you like this genre.
Ryan NelsonApril 19, 2024
I liked it for the most part. I liked the main character, though some of the side plots were just okay. Not bad at all.
Brian GreenOctober 09, 2024
Pretty good overall. I liked the main character, though some of the side plots were just okay. Enjoyable weekend read.
Stephanie CruzSeptember 05, 2024
Honestly one of the better books I've read lately. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Definitely recommend it if you like this genre.
Kimberly EdwardsOctober 05, 2025
Such a great read. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Will be looking for more from this author.
Daniel YoungJune 06, 2025
Finished it in a couple of days. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Will be looking for more from this author.
Paul EdwardsOctober 02, 2024
Glad someone recommended this to me. I loved how the story unfolded. It kept me guessing without being too confusing. A solid 5/5 for me.
Thomas CruzDecember 04, 2024
Good, but not quite perfect. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. Still a good book.
Thomas CollinsSeptember 07, 2025
I was pleasantly surprised. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Worth the time and money.
Mark WilsonOctober 14, 2024
Good, but not quite perfect. The middle dragged a tiny bit, but the ending totally made up for it. Enjoyable weekend read.
Matthew PhillipsJanuary 15, 2025
I was pleasantly surprised. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Worth the time and money.
Paul ScottFebruary 24, 2024
Such a great read. I loved how the story unfolded. It kept me guessing without being too confusing. A solid 5/5 for me.
Paul LeeApril 23, 2024
I liked it for the most part. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. Not bad at all.
Kenneth RiveraJuly 09, 2025
A solid read. It held my attention, even if a few things were a little predictable. Still a good book.
Richard DiazNovember 19, 2024
I liked it for the most part. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. Not bad at all.
Joseph HillMarch 04, 2024
Really enjoyed this one. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Would probably read it again at some point.
Mark MillerDecember 14, 2025
Such a great read. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Would probably read it again at some point.
Anthony CruzJune 30, 2024
Honestly one of the better books I've read lately. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Worth the time and money.
Sarah MartinezSeptember 23, 2025
A solid read. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. Enjoyable weekend read.
Ryan WilliamsSeptember 13, 2024
Honestly one of the better books I've read lately. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Would probably read it again at some point.
Emily TorresMarch 24, 2024
I liked it for the most part. The middle dragged a tiny bit, but the ending totally made up for it. Still a good book.
Jennifer AdamsNovember 10, 2025
A very satisfying read. I loved how the story unfolded. It kept me guessing without being too confusing. Worth the time and money.
Carol HallNovember 05, 2025
Such a great read. I loved how the story unfolded. It kept me guessing without being too confusing. Glad I picked this up.
Dorothy KingAugust 07, 2024
Finished it in a couple of days. I loved how the story unfolded. It kept me guessing without being too confusing. Definitely recommend it if you like this genre.
Jacob PhillipsOctober 29, 2025
Honestly one of the better books I've read lately. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Will be looking for more from this author.
Stephanie LeeSeptember 07, 2025
Pretty good overall. It held my attention, even if a few things were a little predictable. A solid 4 stars from me.
Andrew ClarkApril 20, 2024
Good, but not quite perfect. I liked the main character, though some of the side plots were just okay. Still a good book.
Patricia RobinsonOctober 10, 2025
I was pleasantly surprised. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Definitely recommend it if you like this genre.
Ryan JacksonMay 03, 2025
I was pleasantly surprised. I got really invested in the main character's journey. Everything just clicked for me. Glad I picked this up.
Edward GarciaAugust 07, 2025
Really enjoyed this one. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. A solid 5/5 for me.
Daniel NguyenApril 12, 2024
Honestly one of the better books I've read lately. The writing style is very engaging. It’s easy to follow but still has a lot of depth. A solid 5/5 for me.
John SmithOctober 03, 2024
Such a great read. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Definitely recommend it if you like this genre.
Nicholas AllenSeptember 04, 2024
Glad someone recommended this to me. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Worth the time and money.
Gary NguyenMay 06, 2024
Took me a few chapters to get into it, but it was worth it. It held my attention, even if a few things were a little predictable. Still a good book.
Christopher EdwardsJune 30, 2024
I was pleasantly surprised. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Definitely recommend it if you like this genre.
Elizabeth JonesMay 02, 2025
Honestly one of the better books I've read lately. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Would probably read it again at some point.
Mark ReyesMay 31, 2024
Glad someone recommended this to me. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Would probably read it again at some point.
Edward WalkerMay 11, 2025
Finished it in a couple of days. I got really invested in the main character's journey. Everything just clicked for me. Worth the time and money.
Stephanie JonesNovember 19, 2025
Took me a few chapters to get into it, but it was worth it. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. Not bad at all.
Anthony JacksonMarch 01, 2025
Honestly one of the better books I've read lately. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Would probably read it again at some point.
Michael LopezNovember 20, 2024
Such a great read. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Glad I picked this up.
Stephanie FloresDecember 16, 2024
Glad someone recommended this to me. The author did a great job wrapping everything up at the end. No weird plot holes left behind. A solid 5/5 for me.
Stephanie EdwardsNovember 06, 2024
Such a great read. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Will be looking for more from this author.
Nancy HillJuly 04, 2025
Finished it in a couple of days. The writing style is very engaging. It’s easy to follow but still has a lot of depth. A solid 5/5 for me.
Robert HallApril 17, 2024
Such a great read. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Would probably read it again at some point.
Barbara JohnsonNovember 30, 2024
Good, but not quite perfect. The middle dragged a tiny bit, but the ending totally made up for it. Still a good book.
Barbara NguyenSeptember 01, 2024
It was okay. It felt a bit repetitive in the middle. Could have been shorter. Just right down the middle.
Andrew NguyenOctober 12, 2025
I was pleasantly surprised. I got really invested in the main character's journey. Everything just clicked for me. Would probably read it again at some point.
Gary NguyenNovember 25, 2025
I was pleasantly surprised. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Definitely recommend it if you like this genre.
Robert RobinsonApril 11, 2024
Took me a few chapters to get into it, but it was worth it. It held my attention, even if a few things were a little predictable. Still a good book.
Andrew HillAugust 04, 2024
Not bad, but not my favorite. It felt a bit repetitive in the middle. Could have been shorter. Might work better for someone else, just wasn't completely for me.
Anthony PerezJune 23, 2025
Such a great read. I loved how the story unfolded. It kept me guessing without being too confusing. Definitely recommend it if you like this genre.
David PhillipsJuly 29, 2024
Honestly one of the better books I've read lately. I got really invested in the main character's journey. Everything just clicked for me. Definitely recommend it if you like this genre.
Joshua RodriguezAugust 03, 2024
Pretty good overall. It held my attention, even if a few things were a little predictable. Enjoyable weekend read.
Carol HarrisJuly 25, 2025
A solid read. I liked the main character, though some of the side plots were just okay. I'd probably recommend it to a friend.
Jessica WalkerDecember 09, 2025
Glad someone recommended this to me. I got really invested in the main character's journey. Everything just clicked for me. Glad I picked this up.
Laura WhiteSeptember 09, 2025
Glad someone recommended this to me. I got really invested in the main character's journey. Everything just clicked for me. Worth the time and money.
Robert TorresFebruary 17, 2025
Glad someone recommended this to me. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Will be looking for more from this author.
Amanda WhiteSeptember 25, 2025
Honestly one of the better books I've read lately. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Would probably read it again at some point.
Lisa AllenDecember 05, 2025
I liked it for the most part. Interesting premise and executed fairly well. Just a few slow chapters here and there. Still a good book.
Melissa JacksonJanuary 17, 2025
A very satisfying read. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Definitely recommend it if you like this genre.
Jacob TaylorJune 29, 2025
I was pleasantly surprised. I got really invested in the main character's journey. Everything just clicked for me. Glad I picked this up.
Ashley SanchezFebruary 27, 2025
Finished it in a couple of days. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. A solid 5/5 for me.
Elizabeth JacksonOctober 10, 2025
Such a great read. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Will be looking for more from this author.
Kenneth GarciaOctober 24, 2024
A very satisfying read. I got really invested in the main character's journey. Everything just clicked for me. Will be looking for more from this author.
Paul WhiteSeptember 08, 2024
A very satisfying read. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Glad I picked this up.
David NguyenApril 19, 2025
I have mixed feelings about this one. The pacing was a bit slow and I found myself skimming a few pages. It wasn't terrible, just okay. Probably won't read it again, but it was an okay way to pass the time.
Anthony CruzJuly 13, 2025
Glad someone recommended this to me. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Would probably read it again at some point.
Michael LopezAugust 24, 2025
A solid read. I liked the main character, though some of the side plots were just okay. Not bad at all.
Robert AllenFebruary 26, 2024
A solid read. It held my attention, even if a few things were a little predictable. Not bad at all.
Paul EdwardsJune 25, 2025
I was pleasantly surprised. I got really invested in the main character's journey. Everything just clicked for me. Would probably read it again at some point.
Mary NelsonJanuary 28, 2024
I was pleasantly surprised. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Definitely recommend it if you like this genre.
Elizabeth SmithJanuary 25, 2024
Finished it in a couple of days. The author did a great job wrapping everything up at the end. No weird plot holes left behind. A solid 5/5 for me.
Joseph WrightApril 04, 2025
Pretty good overall. Interesting premise and executed fairly well. Just a few slow chapters here and there. Enjoyable weekend read.
Dorothy TorresMarch 08, 2025
Really enjoyed this one. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Will be looking for more from this author.
Stephanie NelsonJune 28, 2024
Glad someone recommended this to me. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. A solid 5/5 for me.
Barbara HernandezJanuary 12, 2024
I liked it for the most part. It held my attention, even if a few things were a little predictable. Enjoyable weekend read.
Carol HallApril 11, 2025
I liked it for the most part. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. A solid 4 stars from me.
Kimberly GarciaOctober 03, 2024
It was just alright. The writing was fine, but I didn't feel very connected to the characters. They felt a bit flat. Might work better for someone else, just wasn't completely for me.
Paul CruzApril 27, 2024
A solid read. I liked the main character, though some of the side plots were just okay. I'd probably recommend it to a friend.
Linda CampbellJune 05, 2024
Pretty good overall. I liked the main character, though some of the side plots were just okay. I'd probably recommend it to a friend.
Carol GonzalezFebruary 25, 2024
Good, but not quite perfect. It held my attention, even if a few things were a little predictable. Not bad at all.
Elizabeth JacksonApril 12, 2025
A very satisfying read. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Will be looking for more from this author.
Edward GarciaApril 07, 2024
Pretty good overall. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. Not bad at all.
Michelle WrightAugust 09, 2024
I was pleasantly surprised. I got really invested in the main character's journey. Everything just clicked for me. Will be looking for more from this author.
Robert RobinsonMarch 30, 2024
Honestly one of the better books I've read lately. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Will be looking for more from this author.
Stephanie BakerJanuary 24, 2025
Such a great read. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Glad I picked this up.
Stephanie NelsonSeptember 14, 2024
Such a great read. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Would probably read it again at some point.
Kimberly GomezMarch 11, 2025
A solid read. I liked the main character, though some of the side plots were just okay. A solid 4 stars from me.
Emily TorresApril 02, 2025
Pretty good overall. Writing is good, just wish there was a bit more depth in certain parts. Still kept my attention though. I'd probably recommend it to a friend.
Elizabeth SmithAugust 17, 2024
I was pleasantly surprised. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Glad I picked this up.
Kenneth HernandezJuly 10, 2025
Took me a few chapters to get into it, but it was worth it. I liked the main character, though some of the side plots were just okay. Still a good book.
Amanda HernandezJuly 24, 2025
I liked it for the most part. It held my attention, even if a few things were a little predictable. I'd probably recommend it to a friend.
Sharon EvansMarch 09, 2025
I liked it for the most part. It held my attention, even if a few things were a little predictable. A solid 4 stars from me.
Donald TurnerMay 03, 2025
I liked it for the most part. The middle dragged a tiny bit, but the ending totally made up for it. A solid 4 stars from me.
Charles MartinezSeptember 27, 2024
Honestly one of the better books I've read lately. I loved how the story unfolded. It kept me guessing without being too confusing. Glad I picked this up.
David RodriguezJune 28, 2024
I was pleasantly surprised. The writing style is very engaging. It’s easy to follow but still has a lot of depth. A solid 5/5 for me.
Thomas LopezSeptember 02, 2024
A very satisfying read. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Definitely recommend it if you like this genre.
Nicholas TurnerJune 15, 2025
Pretty good overall. It held my attention, even if a few things were a little predictable. I'd probably recommend it to a friend.
Ryan JacksonSeptember 25, 2025
Took me a few chapters to get into it, but it was worth it. It held my attention, even if a few things were a little predictable. Not bad at all.
Stephanie LeeApril 04, 2024
Glad someone recommended this to me. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Worth the time and money.
William HarrisOctober 18, 2025
A solid read. It held my attention, even if a few things were a little predictable. I'd probably recommend it to a friend.
Andrew HillMarch 09, 2024
A very satisfying read. I got really invested in the main character's journey. Everything just clicked for me. Will be looking for more from this author.
Susan LewisOctober 30, 2025
Honestly one of the better books I've read lately. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Would probably read it again at some point.
Robert HallApril 21, 2025
Such a great read. I got really invested in the main character's journey. Everything just clicked for me. Definitely recommend it if you like this genre.
Laura LopezOctober 23, 2025
A solid read. The middle dragged a tiny bit, but the ending totally made up for it. I'd probably recommend it to a friend.
George NguyenOctober 19, 2025
Honestly one of the better books I've read lately. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Would probably read it again at some point.
Matthew BakerJuly 23, 2024
A very satisfying read. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Will be looking for more from this author.
Jacob RiveraJanuary 22, 2024
Good, but not quite perfect. Interesting premise and executed fairly well. Just a few slow chapters here and there. Not bad at all.
George NguyenOctober 17, 2024
Glad someone recommended this to me. I got really invested in the main character's journey. Everything just clicked for me. A solid 5/5 for me.
Paul CruzSeptember 12, 2025
I was pleasantly surprised. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Worth the time and money.
David NelsonMarch 22, 2024
Pretty good overall. It held my attention, even if a few things were a little predictable. A solid 4 stars from me.
John ReyesJanuary 24, 2024
Honestly one of the better books I've read lately. I got really invested in the main character's journey. Everything just clicked for me. A solid 5/5 for me.
Daniel YoungFebruary 24, 2024
I was pleasantly surprised. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Glad I picked this up.
Eric WilliamsMarch 01, 2025
Glad someone recommended this to me. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Will be looking for more from this author.
Thomas YoungApril 10, 2024
Glad someone recommended this to me. I got really invested in the main character's journey. Everything just clicked for me. Worth the time and money.
David RobinsonMarch 29, 2024
A solid read. I liked the main character, though some of the side plots were just okay. A solid 4 stars from me.
David WhiteDecember 29, 2025
A very satisfying read. I loved how the story unfolded. It kept me guessing without being too confusing. Would probably read it again at some point.
Stephanie CruzSeptember 11, 2024
Glad someone recommended this to me. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Glad I picked this up.
Linda ThomasMarch 13, 2024
I was pleasantly surprised. I got really invested in the main character's journey. Everything just clicked for me. Will be looking for more from this author.
Dorothy WilsonFebruary 28, 2025
An average read for me. It felt a bit repetitive in the middle. Could have been shorter. It's fine if you have nothing else to read.
James AndersonMarch 22, 2025
Finished it in a couple of days. It has a good balance of dialogue and description. Everything felt like it moved at the right speed. Worth the time and money.
Joshua HallMarch 21, 2024
Honestly one of the better books I've read lately. I loved how the story unfolded. It kept me guessing without being too confusing. Will be looking for more from this author.
Susan JonesJanuary 16, 2025
I liked it for the most part. It held my attention, even if a few things were a little predictable. Still a good book.
Kimberly TurnerJuly 11, 2025
Honestly one of the better books I've read lately. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Will be looking for more from this author.
David LewisNovember 03, 2024
Really enjoyed this one. The writing style is very engaging. It’s easy to follow but still has a lot of depth. Worth the time and money.
Susan MartinJuly 12, 2025
Not bad, but not my favorite. It had some good moments, but the overall plot felt a bit disjointed in the second half. Probably won't read it again, but it was an okay way to pass the time.
Betty CruzDecember 26, 2024
Finished it in a couple of days. The pacing was spot on and the characters felt real. I didn't find myself getting bored at any point. Worth the time and money.
Sarah EdwardsMay 08, 2025
Honestly one of the better books I've read lately. The author did a great job wrapping everything up at the end. No weird plot holes left behind. Glad I picked this up.
