A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Type to find tags:
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Questions on quadratic functions and equations, second degree polynomials usually in the forms $y=ax^2+bx+c$, $y=a(x-b)^2+c$ or $y=a(x+b)(x+c)$.
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"Mathematical physics consists of the application of mathematics to problems in physics and the development of mathematical methods suitable for such applications and for the formulation of physical t…
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meant for questions about the mathematical principles behind games, riddles, or their possible solutions. If the answer is known to you please do not use this tag to "riddle" other users, …
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Questions on conic sections and their properties; the curves formed by the intersection of a plane and a cone. Circles, ellipses, hyperbolas, and parabolas are examples of conic sections.
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Transformation has many meanings in mathematics. If using this tag, add another tag related to the object being transformed. If there is a tag for your specific kind of transformations, use that one i…
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Order theory deals with properties of orders, usually partial orders or quasi orders but not only those. Questions about properties of orders, general or particular, may fit into this category, as wel…
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for questions about extension fields in abstract algebra. An extension field of a field K is just a field containing K as subfield, but interesting questions arise with them. Use this…
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a vector space equipped with an inner product. The inner product is a generalisation of the "dot" product often used in vector calculus.
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Questions on the evaluation of integrals along a locus in the complex plane.
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Tensor products allow us to build "linear" objects from "multilinear" ones. It can refer to: basic ones from linear algebra/module theory, or more sophisticated versions from differential/algebraic ge…
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for questions about cardinals and related topics such as cardinal arithmetics, regular cardinals and cofinality. Do not confuse with [large-cardinals] which is a technical concept about st…
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Questions related to Brownian motion, a continuous stochastic process denoted by $W_t$, $t\geq 0$, with independent increments, such that $W(t)-W(s)$ is normally distributed, with $0$ mean and varianc…
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for questions concerning history of mathematics, historical primacies of results, and evolution of terminology, symbols, and notations. Consider if History of Science and Mathematics Stac…
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Questions on the use of the methods of real/complex analysis in the study of number theory.
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Computational complexity, a part of theoretical computer science that deals with understanding how efficiently a problem can be solved.
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Should be used with the (group-theory) tag. A group $(G,*)$ is said to be abelian if $a*b=b*a$ for all $a,b\in G.$
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Questions on the factorial function, $n!=n\times(n-1)\times\cdots\times1$. Consider using the tag (gamma-function) if dealing with noninteger arguments.
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homotopic, if one of them can by continuously deformed to another. This gives rise to an equivalence relation. A group called homotopy group can be obtained from the equivalence clas…
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the study of (classes of) mathematical structures (e.g. groups, fields, graphs, universes of set theory) using tools from mathematical logic. Objects of study in model theory are mode…
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used for problems where the goal is to find all functions satisfying the given equation (and maybe some other conditions). So in this case, solving the equation means…
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any representation of a mathematical expression in terms of "known" functions, "known" usually being replaced with "elementary".
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For questions about uniform convergence of a sequence or a series of functions on a set. Also used with the tag [convergence].
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For questions about finding factors of e.g. integers or polynomials
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The study of competitive and non-competitive games, equilibrium concepts such as Nash equilibrium, and related subjects. Combinatorial games such as Nim are under [tag:combinatorial-game-theory], and …
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is for things related to 3-dimensions. For geometry of 3-dimensional solids, please use instead (solid-geometry). For geometry that is not on a plane, but otherwise agnostic of dimensions…
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Questions on coordinate systems, a geometric method where a point in n-dimensions is assigned a corresponding n-tuple of numbers.
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Questions on the various algorithms used in linear algebra computations (matrix computations).
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structures which behave similar to a power set with complement, intersection and union. Questions regarding Boolean algebras as structures, or regarding functions defined from/to …
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Questions concerning predicate calculus, i.e. the logic of quantifiers.
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for questions about distributions (or generalized functions). For questions about "probability distributions", use (probability-distributions). For questions about distributions as sub-bu…
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For posts looking for feedback or verification of a proposed solution.
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For questions about $\mathbb{R}$, the field of real numbers. Often used in conjunction with the real-analysis tag. Do not use this tag for questions on solving equations.
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Questions related to equations, with matrices as coefficients and unknowns.
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The area of statistics that focuses on taking information from samples of a population, in order to derive information on the entire population.
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Questions on polar coordinates, a coordinate system where points are represented by their distance from the origin ($r$) and the angle the line joining the point and the origin makes with the positive…
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For reflexive, symmetric and transitive relations. Use it with the tag (relations).