What is 7x8? This video teaches how you can use your hands to multiply two numbers between 6 and 10 using your fingers.

Here's the reason the method works: https://www.youtube.com/watch?v=eEao6-F7fz8

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In this neat video, I’m connecting two unexpected worlds of linear algebra. Namely, I show that if T is a linear transformation with matrix A, then the matri...

Edmund Harriss introduces a very cool tiling and talks about Tribonacci Numbers.
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Numberphile Podcast: https://www.numberphile.com/podcast
Or on YouTube: https://bit.ly/Numberphile_Pod_Playlist

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Programa de Doutorado: Topologia das Variedades - Aula 18 Inicio: 10h30 Professor: Vinicius Ramos Aulas anteriores: https://bit.ly/2ToLE0x Pré-requisito: Anál...

Programa de Doutorado: Dinâmica Hiperbólica - Aula 19 Inicio: 13h30 Professores: Marcelo Viana / Fernando Lenarduzzi Aulas anteriores: https://bit.ly/2J0NMXR ...

This problem stumped me! But it has a pretty nice solution. Thanks to all patrons! Special thanks this month to Kyle, Michael Anvari, Richard Ohnemus, Shrihari Puranik.

Source
Emailed to me about 2 years ago, traced to the Australian Intermediate Olympiad…

Exemplos mostram nossa dificuldade com o cálculo de possibilidades

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In this video, the third part of the A^2 trilogy, I find all the matrices A with A^2 = I. Of course A = I and A = -I are solutions, but there are many others...

In this video, we will find the exact value of sin(3 degrees). We will see the special special triangles and the angle difference formula! ft. sin(15), sin(18), cos(15), cos(18)

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In this video, I calculate the integral of sin(x^n) from 0 to infinity, without using any complex analysis whatsoever. Instead I’m using special functions like gamma functions and beta functions. It’s a treat for anyone who likes exotic integrals. Enjoy!…

Programa de Doutorado: Topologia das Variedades - Aula 19 Professor: Vinicius Ramos Aulas anteriores: https://bit.ly/2ToLE0x Pré-requisito: Análise em Varieda...