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  2. Psi function - Wikipedia

    en.wikipedia.org/wiki/Psi_function

    Psi function can refer, in mathematics, to the ordinal collapsing function ...

  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. Dedekind psi function - Wikipedia

    en.wikipedia.org/wiki/Dedekind_psi_function

    There is an additive definition of the psi function as well. Quoting from Dickson, [ 1 ] R. Dedekind [ 2 ] proved that, if n {\displaystyle n} is decomposed in every way into a product a b {\displaystyle ab} and if e {\displaystyle e} is the g.c.d. of a , b {\displaystyle a,b} then

  5. 30 Math Puzzles (with Answers) to Test Your Smarts - AOL

    www.aol.com/30-math-puzzles-answers-test...

    They test your brain and critical thinking skills, provide some constructive, educational fun, and provide tangible examples of math lessons you’ll actually use in real life. Math puzzles come ...

  6. Reciprocal Fibonacci constant - Wikipedia

    en.wikipedia.org/wiki/Reciprocal_Fibonacci_constant

    The reciprocal Fibonacci constant ψ is the sum of the reciprocals of the Fibonacci numbers: = = = + + + + + + + +. Because the ratio of successive terms tends to the reciprocal of the golden ratio, which is less than 1, the ratio test shows that the sum converges.

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

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

    the J/psi mesons in particle physics; the stream function in fluid dynamics; the reciprocal Fibonacci constant [69] the second Chebyshev function in number theory [70] the polygamma function in mathematics [71] the supergolden ratio [72] In circadian physiology, ψ represents the phase relationship between a zeitgeber and a biological rhythm. [73]

  8. Euler's totient function - Wikipedia

    en.wikipedia.org/wiki/Euler's_totient_function

    The first thousand values of φ(n).The points on the top line represent φ(p) when p is a prime number, which is p − 1. [1]In number theory, Euler's totient function counts the positive integers up to a given integer n that are relatively prime to n.

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