Number Theory: Euler's Phi Function / Euler's Theorem

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An introduction to Euler's Phi Function and Euler's Theorem
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This is much better than how my professor has done his job. I can actually understand what's going on as compared to his lectures.

XTheCrystalBeastGuyX
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it would be nice to get explanations of your formulas

AlexandreLopez
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You inspire my dream! I'm making it real now

wiiner
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by this video i solve a difficult problem very easily thanks

mathswithrohit
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What's the course and teacher's name?

likhetsahu
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Gcd(40, 44)=4 so why we have used Euler's Theorem in the last exercise?

ajbj
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Does anyone know why she multiplied both sides of the congruency by 3 to the third?

MultiDman
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You sound like all the happiness is sucked out from ur life

georgegeoffrick
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Calculate Փ (440). Hint: Փ(pn ) = pn – p n–1 (can anyone help me with this answer and step by step procedure of this please

)

b.vinith
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I guess we are assuming 1 is prime, but it should not be. I think

santiagolaseul
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madam are you sure formula is phi(p)=p-1? if yes then How it possible
phi(4)=2?
it should be hi(4)=3

fabs-dzjz
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at 3:40 shouldn't phi(4) be 1 and 3? You wrote phi(4) = 1 and 2, but GCD(4, 2) = 2, and not 1?

Thadnill