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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Questions about Pythagorean triples, positive integer solutions to $a^2 + b^2 = c^2$.
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isomorphic if they have a function $f$ which provides an exact pairing of vertices in the two graphs such that for any adjacent vertices $u,v\in \{\mbox{set of vertices of }…
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For questions about networks that inhibit source and sink nodes and a notion of flow.
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For questions regarding the process, consequences, and stability of localizing algebraic structures such as rings, categories, and modules. Not for use with local topological spaces.
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for questions on Quadratic Programming (QP). A QP problem is the problem of minimising or maximising a quadratic objective function subject to affine constraints.
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for the error and complementary error functions (erf and erfc). These are special functions formed by taking definite integrals of the Gaussian/normal distribution function.
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For questions about dividing groups of objects based on their properties.
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properties of topological space which, roughly speaking, say in what way two points, a point and a closed set, or two closed sets can be "separated".
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a construction in group theory generalizing the direct product. It arises as the structure of a group $G$ with a normal subgroup $N$ having a complement $N$.
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Questions on elliptic integrals, integrals that involve the square root of a cubic or quartic polynomial.
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a mathematical object which formalizes some of the essential features of the Cartesian product $X\times G$ of a space $X$ with a group $G$.
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Questions relating to the golden ratio $\varphi = \frac{1+\sqrt{5}}{2}$
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curve in the complex extending from a branch point of the function.
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For questions on solvable groups, their properties, and structure.
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Questions on Bernoulli numbers, a special sequence of rational numbers that arise as the coefficients in the power series expansions of certain elementary functions.
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For questions on Catalan numbers, a sequence of natural numbers that occur in various counting problems.
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For questions regarding the positive-definiteness of matrices.
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for questions regarding the Newton–Raphson method. In numerical analysis the Newton–Raphson method is a method for finding successively better approximations to the roots (or zeroes) of a …
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For questions about approximating real numbers by rational numbers.
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Optimal control theory, an extension of the calculus of variations, is a mathematical optimization method for deriving control policies. (Def: http://en.m.wikipedia.org/wiki/Optimal_control)
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called homogeneous if the following condition is satisfied: If $\phi(x)$ is a solution, so is $c \phi(x)$, where c is an arbitrary (non-zero) constant. (Def: http:…
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In mathematics, a monoidal category (or tensor category) is a category C equipped with a bifunctor ⊗ : C × C → C which is associative up to a natural isomorphism, and an object I which is both a lef…
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For questions about groups where the underlying set has infinite cardinality.
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In mathematics and theoretical physics, the term quantum group denotes various kinds of noncommutative algebra with additional structure. (Def: http://en.m.wikipedia.org/wiki/Quantum_group)
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Various aspects of writing mathematics such as style, notation, grammar, frequently used phrases and common mistakes.
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for questions related to absolute convergence a series.
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Questions on the Riemann hypothesis, a conjecture on the behavior of the complex zeros of the Riemann $\zeta$ function. You might want to add the tag [riemann-zeta] to your question as well.
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a transformation that fixes a line or plane or a more general subset. Reflections appear in geometry, linear algebra, complex analysis, differential equations, etc -- therefore, this ta…
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a ring constructed from a group $G$ and ring $R$. A special case of this construction is group algebra, which occurs naturally in representation theory.
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For questions regarding the variance of a random variable in probability, as well as the variance of a list or data in statistics.
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For questions about infinitesimals, both in an intuitive sense as well as more rigorous settings (see also [nonstandard-analysis]).
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For questions about mathematical constants, that are "significantly interesting in some way".
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For questions on using, finding, or otherwise relating to probability density functions (PDFs)
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For questions related to wavelets and wavelet theory
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In mathematics, in particular abstract algebra, a graded ring is a ring that is a direct sum of abelian groups $R_i$ such that $R_i R_j \subset R_{i+j}$. (Def: http://en.m.wikipedia.org/wiki/Graded_ri…
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Questions relating to deductions relating to the expressions "it is necessary that" and "it is possible that"