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  1. How to put 20 equilateral triangles on sphere

    How to put 20 equilateral triangles on sphere

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  2. Cardano’s formula: Cubic equation

    Cardano’s formula: Cubic equation

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  4. sum of the reciprocals of the primes is divergent

    sum of the reciprocals of the primes is divergent

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  5. Find eigenvalues of matrix with all same element

    Find eigenvalues of matrix with all same element

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  6. Introduction to Pythagorean quadruple

    Introduction to Pythagorean quadruple

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  7. Two ways: Integral of 1/(x^2+1)^2 from 0 to infinity

    Two ways: Integral of 1/(x^2+1)^2 from 0 to infinity

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  8. integral of t^{z-1}/(e^z-1) from 0 to infinity

    integral of t^{z-1}/(e^z-1) from 0 to infinity

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  11. Complex analysis Integral of cos(ax)/coshx from 0 to infinity

    Complex analysis Integral of cos(ax)/coshx from 0 to infinity

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    8
  12. Integral of sec(x) and Integral of 1/sec(x)

    Integral of sec(x) and Integral of 1/sec(x)

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  13. Integral of 1/(x^3-1) from integral of 1/(x^3+1)

    Integral of 1/(x^3-1) from integral of 1/(x^3+1)

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  15. Integral of x^4+1 step by step

    Integral of x^4+1 step by step

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  16. Integral of 1/(x^2+1) by using complex number

    Integral of 1/(x^2+1) by using complex number

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

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

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  18. Mathematical induction exercise: 6^n-1 is divisible by 5

    Mathematical induction exercise: 6^n-1 is divisible by 5

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  19. Hermitian matrix is diagonalizable and orthonormal basis

    Hermitian matrix is diagonalizable and orthonormal basis

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  20. Special quartic equation and cos72

    Special quartic equation and cos72

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  21. More easy mathematical induction exercise

    More easy mathematical induction exercise

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  22. 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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  23. Fractional colorings and the fractional chromatic number of graphs | graph theory | advanced level

    Fractional colorings and the fractional chromatic number of graphs | graph theory | advanced level

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  24. The chromatic number of a graph and min degrees of its subgraphs | graph theory | intermediate level

    The chromatic number of a graph and min degrees of its subgraphs | graph theory | intermediate level

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