Euler Totient/Phi Function-Part 1

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This video is about Euler Phi Function.
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Awesome video. It helps me with Number Theory, Analysis and set Theory, Abstract Algebra, thank you Professor!!!

juanjaimescontreras
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Mam 😘 ur way of teaching is so perfect

simikhaund
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It looks like it can also proved by principles of inclusion and exclusion: n - n/p_1 - n / p_2 - n / p_3 + n/ (p_1*p_2) + n / (p_2 * p_3) etc. But multiplicative property is more elegant!

DachuanHuang
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Mam, can you tell me some good books on number theory?

masumbiswas