Prove Method of infinite Descent : square k is irrational if k is not square free

Prove Method of infinite Descent : square k is irrational if k is not square free

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Probability interview questions:

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Probability theory:

https://www.youtube.com/watch?v=8s-nyRLBsDo&list=PLg9w7tItBlZsvciKHBx8lXXnCtQ7Ou4cV

Complex analysis:

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Combinatorics:

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additive combinatorics:

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微積分 高等微積分 代數

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Real analysis

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Reduction formula in Calculus:

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Integrals of trigonometric functions:

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(algebraic geometry)代數幾何筆記

https://www.youtube.com/playlist?list=PLg9w7tItBlZssQ4Smzgp_bk2rEszKaW0B

Linear algebra Proof:

https://www.youtube.com/playlist?list=PLg9w7tItBlZueH6LMeYzzwPMUlIaRhCZo

環論(ring theory):

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數論跟其他:

number theory and others:

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Riemann Zeta functions:

https://www.youtube.com/playlist?list=PLg9w7tItBlZu4ncqL53iPd1GmwKq8yYoM

Math related to pi:

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Number theory:

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High school math & AP calculus:
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Solving polynomial equation:

https://www.youtube.com/playlist?list=PLg9w7tItBlZsheN8dz8LLPy99AaLb7_-7

工程數學 Engineering Mathematics:

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Laplace transformation:

https://www.youtube.com/playlist?list=PLg9w7tItBlZty21VgNOrLTKg3BM1sFmFE

differential equation:

https://www.youtube.com/playlist?list=PLg9w7tItBlZukQ1yQXKXPo4ZN2yMHwvf1

0xab3acdec0919be9d429baf2190de2e2a4a384c7e

Legendre polynomial:

https://www.youtube.com/playlist?list=PLg9w7tItBlZvG3Ju8YUxEct1tawePe_ZA

Complex analysis:

https://www.youtube.com/playlist?list=PLg9w7tItBlZsYfYG6dUISItqsSRSXaX4B

Gamma Function:

https://www.youtube.com/playlist?list=PLg9w7tItBlZvKhQHLzaULPNtZH7mYNIf9