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  2. Modular arithmetic - Wikipedia

    en.wikipedia.org/wiki/Modular_arithmetic

    The equivalence class modulo m of an integer a is the set of all integers of the form a + k m, where k is any integer. It is called the congruence class or residue class of a modulo m, and may be denoted as (a mod m), or as a or [a] when the modulus m is known from the context.

  3. Philosophical pessimism - Wikipedia

    en.wikipedia.org/wiki/Philosophical_pessimism

    Schopenhauer does not see suicide as a kind of solution to the sufferings of existence. His opposition to suicide is rooted in his metaphysical system. Schopenhauer focuses on human nature — which is governed by the Will. This means that we are in a never ending cycle of striving to achieve our ends, feeling dissatisfied, feeling bored, and ...

  4. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  5. Norm (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Norm_(mathematics)

    In mathematics, a norm is a function from a real or complex vector space to the non-negative real numbers that behaves in certain ways like the distance from the origin: it commutes with scaling, obeys a form of the triangle inequality, and is zero only at the origin.

  6. Equivalence class - Wikipedia

    en.wikipedia.org/wiki/Equivalence_class

    The definition of equivalence relations implies that the equivalence classes form a partition of , meaning, that every element of the set belongs to exactly one equivalence class. The set of the equivalence classes is sometimes called the quotient set or the quotient space of S {\displaystyle S} by ∼ , {\displaystyle \,\sim \,,} and is ...

  7. Frequency - Wikipedia

    en.wikipedia.org/wiki/Frequency

    Visible light is an electromagnetic wave, consisting of oscillating electric and magnetic fields traveling through space. The frequency of the wave determines its color: 400 THz (4 × 10 14 Hz) is red light, 800 THz (8 × 10 14 Hz) is violet light, and between these (in the range 400–800 THz) are all the other colors of the visible spectrum.

  8. Variance - Wikipedia

    en.wikipedia.org/wiki/Variance

    To see how, consider that a theoretical probability distribution can be used as a generator of hypothetical observations. If an infinite number of observations are generated using a distribution, then the sample variance calculated from that infinite set will match the value calculated using the distribution's equation for variance.

  9. Sacred geometry - Wikipedia

    en.wikipedia.org/wiki/Sacred_geometry

    According to Stephen Skinner, the study of sacred geometry has its roots in the study of nature, and the mathematical principles at work therein. [5] Many forms observed in nature can be related to geometry; for example, the chambered nautilus grows at a constant rate and so its shell forms a logarithmic spiral to accommodate that growth without changing shape.