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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a widely used integral transform (transformation of functions by integrals), similar to the Fourier transform.
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if your question involves some type of (co)homology, including (but not limited to) simplicial, singular or group (co)homology. Consider the tag [tag:homological-algebra] for more abstrac…
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Questions on linear programming, the optimization of a linear function subject to linear constraints.
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For posts looking for feedback or verification of a proposed solution.
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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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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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"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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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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For questions about $L^p$ spaces, that is, given a measure space $(X,\mathcal F,\mu)$, the vector space of equivalence class of measurable functions with $p$-th power of the absolute value integrable.…
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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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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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Questions on the evaluation of integrals along a locus in the complex plane.
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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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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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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 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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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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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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For questions about finding factors of e.g. integers or polynomials
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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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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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Questions on the various algorithms used in linear algebra computations (matrix computations).
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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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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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any representation of a mathematical expression in terms of "known" functions, "known" usually being replaced with "elementary".
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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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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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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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an algebraic variety of dimension one. An affine algebraic curve can be described as the zero-locus of $n-1$ independent polynomials of $n$ variables in affine $n$-space over a f…
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Questions about Turing computability and recursion theory, including the halting problem and other unsolvable problems. Questions about the resources required to solving particular problems should be …
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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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Questions concerning predicate calculus, i.e. the logic of quantifiers.
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Questions on (linear or nonlinear) regression, the fitting of functions that best approximate empirical data.
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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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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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the probability that an event occurs given something else has already occurred.