(1/3) Thrilled to announce that my 2nd book is now out!

It is an intro to proofs and higher math, again written in long-form style: There’s lots of discussion between results, “scratch work” before the proofs, 200+ illustrations, fun examples, and jokes.

amzn.to/3oZrMNu
(2/3) Also, after every chapter is a ~2 page intro to an open question, as well as a ~7 page intro to some advanced area of math. You can see which areas in the table of contents below.

The appendices contain advanced proof methods, some beautiful proofs, and writing advice.
(3/3) This book will interest first-time proof writers, as well as those interested in a broad survey of math.

Big thanks to all the people who helped! The editorial board (pictured below) includes four members of #MathTwitter: @jensg0, @deliprao, @gradmathErisa & @lgpcappiello.

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More from @LongFormMath

22 Jun 20
(1/5) There are hundreds of proofs of the Pythagorean theorem, some remarkably simple. Here’s on I just typed up.

Start with any right triangle:
(2/5) Now scale this triangle three times: once by a factor of b, once by a factor of c, and once by a factor of a:
(3/5) Now rotate and/or mirror these, to get this:
Read 5 tweets

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