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  2. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    the Pi function, i.e. the Gamma function when offset to coincide with the factorial; the complete elliptic integral of the third kind; the fundamental groupoid; osmotic pressure; represents: Archimedes' constant (more commonly just called Pi), the ratio of a circle's circumference to its diameter; the prime-counting function

  3. Weierstrass function - Wikipedia

    en.wikipedia.org/wiki/Weierstrass_function

    Animation based on the increasing of the b value from 0.1 to 5. In Weierstrass's original paper, the function was defined as a Fourier series: = = ⁡ (),where < <, is a positive odd integer, and

  4. Projective representation - Wikipedia

    en.wikipedia.org/wiki/Projective_representation

    In the field of representation theory in mathematics, a projective representation of a group G on a vector space V over a field F is a group homomorphism from G to the projective linear group = /, where GL(V) is the general linear group of invertible linear transformations of V over F, and F ∗ is the normal subgroup consisting of nonzero scalar multiples of the identity transformation (see ...

  5. Liouville function - Wikipedia

    en.wikipedia.org/wiki/Liouville_function

    Its value is +1 if n is the product of an even number of prime numbers, and −1 if it is the product of an odd number of primes. Explicitly, the fundamental theorem of arithmetic states that any positive integer n can be represented uniquely as a product of powers of primes: n = p 1 a 1 ⋯ p k a k , where p 1 < p 2 < ... < p k are primes and ...

  6. Silver ratio - Wikipedia

    en.wikipedia.org/wiki/Silver_ratio

    The silver ratio is a Pisot number, [5] the next quadratic Pisot number after the golden ratio. By definition of these numbers, the absolute value 2 − 1 {\displaystyle {\sqrt {2}}-1} of the algebraic conjugate is smaller than 1, thus powers of ⁠ σ {\displaystyle \sigma } ⁠ generate almost integers and the sequence σ n mod 1 ...

  7. Willamette University - Wikipedia

    en.wikipedia.org/wiki/Willamette_University

    The fraternities are Phi Delta Theta, Kappa Sigma, Sigma Alpha Epsilon, Beta Theta Pi, and Sigma Chi. [49] Greek life at Willamette began in the 1920s. In 1942, G. Herbert Smith, a member of Beta Theta Pi, became President of Willamette, and invited more fraternities and sororities onto campus. Pi Beta Phi became the first national sorority at ...

  8. Alpha Omega (fraternity) - Wikipedia

    en.wikipedia.org/wiki/Alpha_Omega_(fraternity)

    1921: Pi Student Chapter was formed in Toronto thereby expanding Alpha Omega into an international scope; 1924: First non-US alumni chapter was founded in Toronto; 1932: (October 7), merger with Alpha Zeta Gamma completed with chartering of Alpha Kappa and Alpha Lambda. 1936: Alpha Omega establishes the Achievement Medal.