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  2. How to Solve It - Wikipedia

    en.wikipedia.org/wiki/How_to_Solve_It

    How to Solve It (1945) is a small volume by mathematician George Pólya, describing methods of problem solving. [1] This book has remained in print continually since ...

  3. Quintic function - Wikipedia

    en.wikipedia.org/wiki/Quintic_function

    where a = ⁠ 5(4ν + 3) / ν 2 + 1 ⁠. Using the negative case of the square root yields, after scaling variables, the first parametrization while the positive case gives the second. The substitution c = ⁠ −m / ℓ 5 ⁠, e = ⁠ 1 / ℓ ⁠ in the Spearman–Williams parameterization allows one to not exclude the special case a = 0 ...

  4. abc conjecture - Wikipedia

    en.wikipedia.org/wiki/Abc_conjecture

    In these bounds, K 1 and K 3 are constants that do not depend on a, b, or c, and K 2 is a constant that depends on ε (in an effectively computable way) but not on a, b, or c. The bounds apply to any triple for which c > 2. There are also theoretical results that provide a lower bound on the best possible form of the abc conjecture.

  5. Discrete Fourier transform - Wikipedia

    en.wikipedia.org/wiki/Discrete_Fourier_transform

    Fig 2: Depiction of a Fourier transform (upper left) and its periodic summation (DTFT) in the lower left corner. The spectral sequences at (a) upper right and (b) lower right are respectively computed from (a) one cycle of the periodic summation of s(t) and (b) one cycle of the periodic summation of the s(nT) sequence.

  6. C syntax - Wikipedia

    en.wikipedia.org/wiki/C_syntax

    A snippet of C code which prints "Hello, World!". The syntax of the C programming language is the set of rules governing writing of software in C. It is designed to allow for programs that are extremely terse, have a close relationship with the resulting object code, and yet provide relatively high-level data abstraction.

  7. 1 + 2 + 3 + 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    where f (2k−1) is the (2k − 1)th derivative of f and B 2k is the (2k)th Bernoulli number: B 2 = ⁠ 1 / 6 ⁠, B 4 = ⁠− + 1 / 30 ⁠, and so on. Setting f ( x ) = x , the first derivative of f is 1, and every other term vanishes, so [ 15 ]

  8. Finite element method - Wikipedia

    en.wikipedia.org/wiki/Finite_element_method

    An application of the Riesz representation theorem for Hilbert spaces shows that there is a unique solving (2) and, therefore, P1. This solution is a-priori only a member of H 0 1 ( 0 , 1 ) {\displaystyle H_{0}^{1}(0,1)} , but using elliptic regularity, will be smooth if f {\displaystyle f} is.

  9. Crossed ladders problem - Wikipedia

    en.wikipedia.org/wiki/Crossed_ladders_problem

    ⁠ 1 / 1/2 ⁠ + ⁠ 1 / 1 ⁠ = ⁠ 1 / h ⁠ ∴ 2 + 1 = ⁠ 1 / h ⁠ ∴ h = ⁠ 1 / 2 + 1 ⁠ = ⁠ 1 / 3 ⁠ One side (left in the illustration) is partially folded in half and pinched to leave a mark. The intersection of a line from this mark to an opposite corner (red) with a diagonal (blue) is exactly one third from the bottom edge.