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  2. Logarithmic spiral - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_spiral

    [1] [2] More than a century later, the curve was discussed by Descartes (1638), and later extensively investigated by Jacob Bernoulli, who called it Spira mirabilis, "the marvelous spiral". The logarithmic spiral is distinct from the Archimedean spiral in that the distances between the turnings of a logarithmic spiral increase in a geometric ...

  3. Viktor Antonov (art director) - Wikipedia

    en.wikipedia.org/wiki/Viktor_Antonov_(art_director)

    Antonov died in February 2025, at the age of 52. [2] The news emerged from an Instagram post by Half-Life's lead writer, Marc Laidlaw . In his message, Laidlaw described Antonov as a "visionary," calling him "brilliant and original" and saying he "made everything better".

  4. Natural logarithm - Wikipedia

    en.wikipedia.org/wiki/Natural_logarithm

    The natural logarithm of a number is its logarithm to the base of the mathematical constant e, which is an irrational and transcendental number approximately equal to 2.718 281 828 459. [1] The natural logarithm of x is generally written as ln x , log e x , or sometimes, if the base e is implicit, simply log x .

  5. Complex logarithm - Wikipedia

    en.wikipedia.org/wiki/Complex_logarithm

    Those two copies can be visualized as two levels of a parking garage, and one can get from the level of the lower half plane up to the level of the lower half plane by going radians counterclockwise around 0, first crossing the positive real axis (of the level) into the shared copy of the upper half plane and then crossing the negative real ...

  6. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    Instead, the half-life is defined in terms of probability: "Half-life is the time required for exactly half of the entities to decay on average". In other words, the probability of a radioactive atom decaying within its half-life is 50%. [2] For example, the accompanying image is a simulation of many identical atoms undergoing radioactive decay.

  7. Lambda calculus - Wikipedia

    en.wikipedia.org/wiki/Lambda_calculus

    Lambda calculus is Turing complete, that is, it is a universal model of computation that can be used to simulate any Turing machine. [3] Its namesake, the Greek letter lambda (λ), is used in lambda expressions and lambda terms to denote binding a variable in a function.

  8. SymPy - Wikipedia

    en.wikipedia.org/wiki/SymPy

    SymPy is an open-source Python library for symbolic computation.It provides computer algebra capabilities either as a standalone application, as a library to other applications, or live on the web as SymPy Live [2] or SymPy Gamma. [3]

  9. Conjugate prior - Wikipedia

    en.wikipedia.org/wiki/Conjugate_prior

    In Bayesian probability theory, if, given a likelihood function (), the posterior distribution is in the same probability distribution family as the prior probability distribution (), the prior and posterior are then called conjugate distributions with respect to that likelihood function and the prior is called a conjugate prior for the likelihood function ().