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

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

    Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.

  3. Psi (Greek) - Wikipedia

    en.wikipedia.org/wiki/Psi_(Greek)

    The Greek alphabet on a black-figure pottery vessel, with an archaic chickenfoot-shaped psi.. Psi / ˈ (p) s aɪ, ˈ (p) s iː / (P)SY, (P)SEE [1] (uppercase Ψ, lowercase ψ or 𝛙; Greek: ψι psi) is the twenty-third and penultimate letter of the Greek alphabet and is associated with a numeric value of 700.

  4. Nu (letter) - Wikipedia

    en.wikipedia.org/wiki/Nu_(letter)

    The lower-case letter ν is used as a symbol in many academic fields. Uppercase nu is not used, because it appears identical to Latin N. Mathematics: Degrees of freedom in statistics. The greatest fixed point of a function, as commonly used in the μ-calculus. Free names of a process, as used in the π-calculus.

  5. Quartic reciprocity - Wikipedia

    en.wikipedia.org/wiki/Quartic_reciprocity

    Quartic or biquadratic reciprocity is a collection of theorems in elementary and algebraic number theory that state conditions under which the congruence x 4 ≡ p (mod q) is solvable; the word "reciprocity" comes from the form of some of these theorems, in that they relate the solvability of the congruence x 4 ≡ p (mod q) to that of x 4 ≡ q (mod p).

  6. Sigma model - Wikipedia

    en.wikipedia.org/wiki/Sigma_model

    In physics, a sigma model is a field theory that describes the field as a point particle confined to move on a fixed manifold. This manifold can be taken to be any Riemannian manifold , although it is most commonly taken to be either a Lie group or a symmetric space .

  7. Alpha Gamma Upsilon - Wikipedia

    en.wikipedia.org/wiki/Alpha_Gamma_Upsilon

    Thus, Alpha Sigma Phi gained five chapters from the merger. Unlike Alpha Sigma Phi's mergers with Phi Pi Phi and Alpha Kappa Pi, there was no blanket invitation to Alpha Gamma Upsilon alumni to be initiated into Alpha Sigma Phi. However, some of the more prominent leaders of Alpha Gamma Upsilon did so.

  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.