Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
For questions on Euler products, an expansion of a Dirichlet series into an infinite product indexed by prime numbers.
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A brief study of transcendental numbers and algebraic independence theories; currently an on-development branch of mathematics with a lot of open problems.
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Questions on mathematical career development. Keep in mind that asking for personal advice about your individual career development is not allowed on Mathematics Stack Exchange. Also consider whether your question is more appropriate for Academia Stack Exchange.
135 questions
For questions related to monomorphisms, which are categorical generalizations of injective functions.
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Information theory is a study of probability and statistics using the techniques of differential geometry. The area covers statistical model, Fisher metric, $\alpha$ connection, canonical divergence etc.
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Fuzzy logic is a form of many-valued logic that deals with approximate, rather than fixed and exact reasoning.
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For questions about various alternative set theories substantially different from ZFC. For example, NF and NFU, IST, ETCS, SP, AST.
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For questions relating to Einsteins special relativity theory, the equivalence of physical laws in different inertial frames.
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For questions related to semiring. In abstract algebra, a semiring is an algebraic structure similar to a ring, but without the requirement that each element must have an additive inverse.
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A rng is an associative ring without necessarily having a multiplicative identity (rng = ring - $i$dentity).
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Use this tag for questions related to the Hamilton-Jacobi equation, which in mathematics is a necessary condition describing extremal geometry in generalizations of problems from the calculus of variations and in physics is an alternative formulation of classical mechanics.
131 questions
This tag is for questions about combinatorial and computational issues with regards to calendar systems. A typical, well-known mathematical result in this direction is John Conway's Doomsday Algorithm for computing the "day of the week" associated to a given date.
131 questions
For questions related to tensor decomposition. A tensor decomposition is any scheme for expressing a tensor as a sequence of elementary operations acting on other, often simpler tensors.
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For questions involving the Hausdorff distance (also known as the Hausdorff metric) between closed, bounded, non-empty subsets of normed linear spaces (or more generally, any metric space).
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This tag is for questions regarding to the Gateaux differential or, Gateaux derivative, a generalization of the concept of directional derivative in differential calculus. It is often used to formalize the functional derivative commonly used in Physics, particularly Quantum field theory.
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In mathematics, a Fermat number, named after Pierre de Fermat who first studied them, is an integer of the form $$F_{n} =
2^{2^n} + 1$$ where $n$ is a nonnegative integer. The first few Fermat numbers are: $$3,\ 5,\ 17,\ 257,\ 65537,\ \cdots $$
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For question on extrapolation, the process of estimating, beyond the original observation interval.
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A signed measure is a countably additive set function on a sigma-algebra and taking values in the extended reals, but not permitted to assign negative infinity to a set.
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Reverse mathematics is the study of which axioms are required to prove mathematical theorems. This study is carried out by using formal theories of arithmetic, particularly subsystems of second-order arithmetic. Similar results in the context of set theory, for example those related to the axiom of choice and ZF set theory, should use the set-theory tag instead, possibly in combination with the axiom-of-choice tag.
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For questions related to the mathematical operations and analysis of astronomical and astrophysical observations, processes and dynamics.
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For questions on the Zariski-open immersion, étale, flat, or other topologies defined via classes of morphisms in a category of schemes. Not to be confused with the usual Zariski topology in commutative algebra and algebraic geometry.
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For questions on Gauss sums, a particular kind of finite sum of roots of unity.
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A bounded sequence of real numbers is said to be equidistributed, or uniformly distributed, if the proportion of terms falling in a subinterval is proportional to the length of that interval.
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Differential algebra is the study of differential rings and fields and related structures.
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For questions about sufficient statistics. A statistic is sufficient for a parametric model if the distribution of the data conditioned on the statistic is parameter-free. For more general questions about statistics and estimators, please use "statistical-inference".
127 questions
The Schur-complement captures several relationships between the properties of a block matrix and the properties of its blocks, such as semi-definiteness, Cholesky decomposition, etc.
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In the basic Pólya urn model, the urn contains x white and y black balls; one ball is drawn randomly from the urn and its color observed; it is then replaced in the urn, and an additional ball of the same color is added to the urn.
127 questions
Questions about the Euler-Maclaurin summation formula. For questions about Euler's formula, consider using the tag (complex-numbers) instead. For questions about Maclaurin series, use (taylor-expansion).
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For questions regarding Hensel's lifting lemma in modular arithmetic and its generalization to commutative rings.
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Use this tag for questions related to algebraic stacks, which are a stacks in groupoids X over the etale site such that the diagonal map of X is representable, and there exists a smooth surjection from a scheme to X.
126 questions
Use this tag for questions pretaining to q-analogs of functions, for example q-Binomials, $q$-derivatives, the q-theta function, the q-Pochhammer symbol, etc.
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For questions about congruent geometric figures, e.g., determining whether one figure is congruent to another.
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Analogue of radians on spheres. A sphere has solid angle $4\pi$ comparing to the $2\pi$ radian for a circle.
124 questions