Tags
A tag is a keyword or label that categorizes your question with other, similar questions.
69 questions
69 questions
In geometry, an envelope of a continuous family of differentiable curves is a curve that touches each member of that family at some point, and these points of tangency together form the whole envelope. Therefore it is the limiting curve of the intersection of contiguous members of the initial family.
69 questions
Use this tag for questions related to Boolean rings such as the ring of integers modulo $2$ $\mathbb Z/2\mathbb Z$.
69 questions
A semiprime is a natural number that is the product of two prime numbers. This tag is intended for questions about, related to, or involving semiprime numbers.
68 questions
Ramanujan summation is a technique invented by the mathematician Srinivasa Ramanujan for assigning a value to infinite divergent series.
68 questions
An ordered group is a group with a (partial) order which the group operation preserves.
68 questions
68 questions
For questions about Stiefel-manifolds, the set of all orthonormal $k$-frames in $\Bbb R^n$.
67 questions
Obstruction theory is a name given to two different mathematical theories, both of which yield cohomological invariants.
67 questions
Use this tag for questions related to solving equations involving polynomials.
67 questions
For questions on the definition, properties and applications of viscosity solutions.
66 questions
For all questions about *K3 surfaces*, that is complex or algebraic smooth surfaces which are regular with trivial canonical bundle.
66 questions
This tag is for questions relating to dispersive partial differential equation or dispersive PDE. Informally, “dispersion” will refer to the fact that different frequencies in this equation will tend to propagate at different velocities, thus dispersing the solution over time.
66 questions
A cross section is the intersection of a body in three-dimensional space with a plane, or the analog in higher-dimensional space. Cutting an object into slices creates many parallel cross sections.
66 questions
Use for any questions relating to understanding if one entity causes another. This can be at any of the three rungs of causality: association, intervention, or counterfactual. Topics included are do-calculus, causal diagrams, analysis of confounding, $d$-separation, back-door criterion, back-door adjustments, front-door adjustments, instrumental variables, and mediation analysis, among others.
66 questions
This tag is for questions about Betti numbers. In algebraic topology, the Betti numbers are used to distinguish topological spaces based on the connectivity of n-dimensional simplicial complexes.
66 questions
65 questions
Macaulay2 is a software system devoted to supporting research in algebraic geometry and commutative algebra.
65 questions
This tag is for questions relating to Legendre Functions (or Legendre Polynomials), solutions of Legendre's differential equation (generalized or not) with non-integer parameters.
65 questions
Isomorphisms between members of infinite families of mathematical objects (finite simple groups, Lie groups etc), that are not examples of a pattern of such isomorphisms.
65 questions
65 questions
Use this tag for questions about the curve traced by a point on a circle as it rolls along a straight line.
65 questions
Use this tag for questions related to a statistical test or metric that relies on random sampling with replacement.
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For questions related to Boolean function (whose arguments and result assume values from a two-element set).
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For questions about billiards; dynamical systems involving point particles (billiard balls) that travel in straight lines on the interior of some bounded domain (the billiard table) and experience perfectly elastic reflections on collision with boundary.
65 questions
Semialgebraic geometry is the study of semialgebraic sets. This tag is intended for problems in (or relating to) semialgebraic geometry and its generalizations: semianalytic, subanalytic, and o-minimal geometries. These areas have strong connections to logic via the Tarski-Seidenberg theorem, and solutions to problems in this tag often involve a mix of geometric and logical arguments.
64 questions
64 questions
For questions about the two phase simplex method, which is an algorithm to solve a linear program which has no initial basic feasible solution.
63 questions
For questions about repunit numbers, that is, numbers that contain only the digit 1.
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For questions that lie between the intersection of significant mathematical problems and fundamental questions in biology.
63 questions
For questions about (associated) Laguerre polynomials, which arise in quantum physics.
63 questions
Use of the Lagrange–Bürmann formula, which gives the Taylor series expansion of the inverse function of an analytic function.
63 questions
In mathematics, the notion of a germ of an object in/on a topological space is an equivalence class of that object and others of the same kind which captures their shared local properties. In particular, the objects in question are mostly functions (or maps) and subsets
63 questions