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Why invertible matrices must be square. Definition of invertible matrix and showing that a 3x2 and a 2x3 matrix cannot be square.

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Integral of sec^3x, https://youtu.be/6XlSP58u-is

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Programa de Mestrado: Combinatória I - Aula 15 Professor: Robert Morris Homepage: https://impa.br/~rob Aulas anteriores: https://goo.gl/j453Mz Conjuntos: teo...

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View full lesson: https://ed.ted.com/lessons/where-do-math-symbols-come-from-john-david-walters

Math is full of symbols: lines, dots, arrows, English letters, Greek letters, superscripts, subscripts…

Welcome to the awesome 12-part series on the Gaussian integral. In this series of videos, I calculate the Gaussian integral in 12 different ways. Which method is the best? Watch and find out!

In this video, I use a technique similar to Feynman's technique…

This question stumped some of the smartest maths students in Australia, and there's no way I would have solved it in an exam! Can you figure it out?

Syndey Morney Herald and video solution
https://www.smh.com.au/education/the-state-s-top-maths-students-show…

When/what was the first example that you dealt with that you had to add then subtract something in order to solve the problem or finish the proof? Well, here's my first experience, factoring x^6-64, what's yours?

Middle school, high school, community college…

integral of 1/(1- x^2)^(3/2) vs integral of x/(1- x^2)^(3/2),
The answers are also very interesting!

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Da medição do tempo à navegação marítima, a matemática era essencial para as antigas civilizações. A jornada da matemática começou no Egito, na Mesopotâmia e na Grécia, mas após o declínio dessas civilizações, estagnou no Ocidente. No Oriente, entretanto…

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Writing a matrix as a product of elementary matrices, using row-reduction

Check out my Matrix Algebra playlist: https://www.youtube.com/playlist?list=PLJb1qAQIrmmAIZGo2l8SWvsHeeCLzamx0


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Programa de Mestrado: Combinatória I - Aula 16 Professor: Robert Morris Homepage: https://impa.br/~rob Aulas anteriores: https://goo.gl/j453Mz Conjuntos: teo...