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  2. Viète's formula - Wikipedia

    en.wikipedia.org/wiki/Viète's_formula

    Viète obtained his formula by comparing the areas of regular polygons with 2 n and 2 n + 1 sides inscribed in a circle. [ 1 ] [ 2 ] The first term in the product, 2 / 2 {\displaystyle {\sqrt {2}}/2} , is the ratio of areas of a square and an octagon , the second term is the ratio of areas of an octagon and a hexadecagon , etc.

  3. Euler's identity - Wikipedia

    en.wikipedia.org/wiki/Euler's_identity

    The number e (e = 2.71828...), also known as Euler's number, which occurs widely in mathematical analysis The number i , the imaginary unit such that i 2 = − 1 {\displaystyle i^{2}=-1} The equation is often given in the form of an expression set equal to zero, which is common practice in several areas of mathematics.

  4. Perimeter of an ellipse - Wikipedia

    en.wikipedia.org/wiki/Perimeter_of_an_ellipse

    known as the complete elliptic integral of the second kind, the perimeter can be expressed in terms of that function as simply P = 4 a E ( e 2 ) {\displaystyle P=4aE(e^{2})} . The integral used to find the area does not have a closed-form solution in terms of elementary functions .

  5. Proof that 22/7 exceeds π - Wikipedia

    en.wikipedia.org/wiki/Proof_that_22/7_exceeds_π

    Proofs of the mathematical result that the rational number ⁠ 22 / 7 ⁠ is greater than π (pi) date back to antiquity. One of these proofs, more recently developed but requiring only elementary techniques from calculus, has attracted attention in modern mathematics due to its mathematical elegance and its connections to the theory of Diophantine approximations.

  6. Wigner's theorem - Wikipedia

    en.wikipedia.org/wiki/Wigner's_theorem

    Theorem (Bargmann) — In a sufficiently small neighborhood of e, the choice ω(g 1, g 2) ≡ 1 is possible for semisimple Lie groups (such as SO(n), SO(3,1) and affine linear groups, (in particular the Poincaré group). More precisely, this is exactly the case when the second cohomology group H 2 (g, R) of the Lie algebra g of G is trivial. [21]

  7. Higher-dimensional gamma matrices - Wikipedia

    en.wikipedia.org/wiki/Higher-dimensional_gamma...

    There are 2 d such products, but only N 2 are independent, spanning the space of N × N matrices. Typically, Γ ab provide the (bi)spinor representation of the ⁠ 1 / 2 ⁠ d(d − 1) generators of the higher-dimensional Lorentz group, SO + (1, d − 1), generalizing the 6 matrices σ μν of the spin representation of the Lorentz group in ...

  8. Pi Mu - Wikipedia

    en.wikipedia.org/wiki/Pi_Mu

    At the time of the merger, Pi Mu had initiated some 1,500 members. [2] Under the terms of the merger, members of the Beta and Gamma chapters of Pi Mu were initiated into the Theta Eta chapter of Phi Chi. The Alpha chapter of Pi Mu was installed as the Pi Mu chapter of Phi Chi on October 14, 1922.