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  1. Prove Method of infinite Descent (Vieta's jumping) : (a^2+b^2)/(ab+1) is square, imo1988

    Prove Method of infinite Descent (Vieta's jumping) : (a^2+b^2)/(ab+1) is square, imo1988

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  3. Prove Method of infinite Descent : no nontrivial solutions x^2+y^2=3z^2

    Prove Method of infinite Descent : no nontrivial solutions x^2+y^2=3z^2

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    3
  4. Plot Mcdonald Shape by function

    Plot Mcdonald Shape by function

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    1
  8. Linear algebra advanced basic: Zorn's lemma, exchange lemma, dimension

    Linear algebra advanced basic: Zorn's lemma, exchange lemma, dimension

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  9. sinx+sin2x+sin3x+...+sin nx, cosx+cos2x+cos3x+cos 4 x+...+cos nx

    sinx+sin2x+sin3x+...+sin nx, cosx+cos2x+cos3x+cos 4 x+...+cos nx

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  10. Field theory (Abstract Algebra)

    Field theory (Abstract Algebra)

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  12. Mathematical induction middle level exercise

    Mathematical induction middle level exercise

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    7
  14. Special quartic equation and cos72

    Special quartic equation and cos72

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    4
    12
  15. a_{n+2}=5a_{n+1}-6a_{n} Mathematical induction

    a_{n+2}=5a_{n+1}-6a_{n} Mathematical induction

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    7
  16. Volume of sphere, Cone, Pyramid

    Volume of sphere, Cone, Pyramid

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  17. Homomorphism of ring and ideal, quotient ring

    Homomorphism of ring and ideal, quotient ring

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  18. Schrodinger equation and Klein Gordan equation continuity equation

    Schrodinger equation and Klein Gordan equation continuity equation

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  19. zero morphism and kernel and cokernel

    zero morphism and kernel and cokernel

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  20. Gaussian integer and Fermat theorem

    Gaussian integer and Fermat theorem

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  21. Normal subgroup and quotient subgroup

    Normal subgroup and quotient subgroup

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