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A knot K is an n-embeddable knot if it can be placed on a genus n standard embedded surface without crossings, but K cannot be placed on any standardly embedded surface of ...

The second-order ordinary differential equation (x^2y^')^'+x^2y^n=0.

An endogenous variable is an economic variable that is related to other economic variables and determines their equilibrium levels.

Given a module M over a unit ring R, the set End_R(M) of its module endomorphisms is a ring with respect to the addition of maps, (f+g)(x)=f(x)+g(x), for all x in M, and the ...

A finite-dimensional Lie algebra all of whose elements are ad-nilpotent is itself a nilpotent Lie algebra.

A modular form which is not allowed to have poles in the upper half-plane H or at iinfty.

To enumerate a set of objects satisfying some set of properties means to explicitly produce a listing of all such objects. The problem of determining or counting all such ...

The problem of determining (or counting) the set of all solutions to a given problem.

An agreement in which all parties feel as if they have received the best deal.

A morphism f:Y->X in a category is an epimorphism if, for any two morphisms u,v:X->Z, uf=vf implies u=v. In the categories of sets, groups, modules, etc., an epimorphism is ...