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Apt for questions on the Gromov boundary which is the set of all points at infinity. For instance, the Gromov boundary of the real line is two points, corresponding to positive and negative infinity.
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Given a $S_n$-stable family $F$ of homogeneous polynomials in the variables $x_{ij}$ with $1≤i≤\ell$ and $1≤j≤n$, the polarization module generated by the family $F$ is the smallest vector space closed under taking partial derivatives and closed under the action of polarization operators that contains $F$.
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Arithmetic topology is an area of mathematics that is a combination of algebraic number theory and topology. It establishes an analogy between number fields and closed, orientable 3-manifolds; and between ideals in the ring of integers and links and knots.
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Apt for questions related to Mathieu groups. All the sporadic Mathieu groups are multiply transitive.
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For questions related to left factorials, $!n$ (that is, either subfactorials or factorial sums).
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Questions about hyperbolic polynomials (in a certain direction $e$): multivariate homogeneous polynomials $p(x)$ that satisfy $p(e)>0$ and $t\mapsto p(x-te)$ is real rooted.
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For questions related to fiber derivatives (which is used to convert between the Lagrangian and Hamiltonian forms).
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For questions related to Dini derivatives (or Dini derivates). They are a class of generalizations of the derivative.
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