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  1. Gaussian integer and Fermat theorem

    Gaussian integer and Fermat theorem

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  2. Ring theory lecture - definition

    Ring theory lecture - definition

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  3. Counting formula in Group theory

    Counting formula in Group theory

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  5. Permutation group (Symmetric group)

    Permutation group (Symmetric group)

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  6. Construction in categories: product/coproduct, equalizer/coequalizer, Pushout/pullbacks

    Construction in categories: product/coproduct, equalizer/coequalizer, Pushout/pullbacks

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  7. More easy mathematical induction exercise

    More easy mathematical induction exercise

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  9. Can you prove this: square root of 2 of 2= square root of 2 to the power square root of 2

    Can you prove this: square root of 2 of 2= square root of 2 to the power square root of 2

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  10. Find eigenvalues of matrix with all same element

    Find eigenvalues of matrix with all same element

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  11. Hermitian matrix is diagonalizable and orthonormal basis

    Hermitian matrix is diagonalizable and orthonormal basis

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  12. 黎曼猜想 What is Riemann hypothesis (14): Higher L function

    黎曼猜想 What is Riemann hypothesis (14): Higher L function

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  13. Correspondence theorem in Group theory and third isomorphism theorem

    Correspondence theorem in Group theory and third isomorphism theorem

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  14. Volume of sphere, Cone, Pyramid

    Volume of sphere, Cone, Pyramid

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  15. How to put 20 equilateral triangles on sphere

    How to put 20 equilateral triangles on sphere

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  16. Cardano’s formula: Cubic equation

    Cardano’s formula: Cubic equation

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  17. Trigonometry: Product of sin(kpi/n) from k=1 to n-1

    Trigonometry: Product of sin(kpi/n) from k=1 to n-1

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  18. Field theory (Abstract Algebra)

    Field theory (Abstract Algebra)

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  19. sum of the reciprocals of the primes is divergent

    sum of the reciprocals of the primes is divergent

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  23. integral of x^n lnx from 0 to 1

    integral of x^n lnx from 0 to 1

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    7
  24. Inner product space and p norm

    Inner product space and p norm

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  25. In triangle, tanA+tanB+tanC=tanA*tanB*tanC

    In triangle, tanA+tanB+tanC=tanA*tanB*tanC

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