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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.

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a widely used integral transform (transformation of functions by integrals), similar to the Fourier transform.
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For questions about formal deduction of first-order logic formula or metamathematical properties of first-order logic.
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formed by making a series $\sum_{n\geq 0} a_n x^n$ out of a sequence $a_n$. They are used to count objects in enumerative combinatorics.
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For sequences of functions, uniform convergence is a mode of convergence stronger than pointwise convergence, preserving certain properties such as continuity. This tag should be used with the tag [co…
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the instinctive impression regarding mathematical ideas which originate naturally without regard to formal mathematical proofs. It may or may not stem from a cognitive ration…
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for elemetary physical questions. This tag is intended for questions on modern mathematical methods used in quantum theory, general relativity, string theory, integrable system etc…
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when you want to determine the thinking that is needed to solve a certain type of problem, as opposed to looking for a specific answer to a question.
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Questions concerning predicate calculus, i.e. the logic of quantifiers.
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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 tensor products, which allow us to build "linear" objects from "multilinear" ones. Add other specific tags to indicate the subject you're referring to.
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Questions related to equations, with matrices as coefficients and unknowns.
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For questions about $\mathbb{R}$, the field of real numbers. Often used in conjunction with the real-analysis tag.
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For questions involving radical of numbers or radical of expressions (i.e. numbers/expressions raised to the power of a fraction).
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For mathematical questions about MATLAB; questions purely about the language, syntax, or runtime errors would likely be better received on Stack Overflow. MATLAB is a high-level language and interacti…
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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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Questions on the factorial function, $n!=n\cdot(n-1)\cdot...\cdot1$. Consider using the tag (gamma-function) if dealing with noninteger arguments.
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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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Questions on the evaluation of integrals along a locus in the complex plane.
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used for problems where the goal is to find all functions satisfying the given equation and possibly other conditions. Solving the equation means finding all function…
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For questions related to the teaching and learning of mathematics. Note that Mathematics Educators Stack Exchange may be a better home for narrowly scoped questions on specific issues in mathematics e…
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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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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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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 use of the methods of real/complex analysis in the study of number theory.
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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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For questions about finding factors of e.g. integers or polynomials
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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 things related to 3 dimensions. For geometry of 3-dimensional solids, please use instead (solid-geometry). For non-planar geometry, but otherwise agnostic of dimensions, perhaps (euclidean-geometr…
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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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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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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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Use for questions about the efficiency of a specific algorithm (the amount of resources, such as running time or memory, that it requires) or for questions about the efficiency of any algorithm solvin…
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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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Questions on fractions, i.e. expressions (not values) of the form $\frac ab$, including arithmetic with fractions. Not to be confused with the tag (rational-numbers): fractions denote rational numbers…
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continuous Fourier transform, discrete Fourier transform (DFT), discrete cosine transform (DCT), discrete sine transform (DST)
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Questions on the various algorithms used in linear algebra computations (matrix computations).