V Workshop on Poisson Geometry and Related Topics Camilo Angulo (USP) The goal of this workshop is to gather researchers (mostly based in Brazil) with intere...

In this video, I compute an antiderivative of 1/(1-x^2) in two ways: 1) Using partial fractions and 2) Using hyperbolic trig substitution. From those two approaches I derive a really cool identity, which shows that you can derive mathematical identities not…

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An infinite geometric series converges only if |r| is less than 1. When it diverges, things are a lot more fun!!! And yes, this is usually done with 0 = 1-1+...

Revisiting my video that has the most number of dislikes, will this make the original has more or less dislikes?? I do not know! This is just a math paradox showing we can't do ratio with infinities in the usual sense. Suscribe to @blackpenredpen for more…

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So, I finally have a chance to show you how to solve a definite…

This problem was part of a written interview test for Amazon in India. A drawer contains 12 identical black socks and 12 identical white socks. If you pick 2 socks at random, what is the probability of getting a matching pair?

My blog post for this video…