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L is a subnormal subgroup of H if there is a "normal series" (in the sense of Jordan-Hölder) from L to H.

A quantity which is subtracted from another (the minuend).

The relationship x succeeds (or follows) y is written x≻y. The relation x succeeds or is equal to y is written x>=y.

The set closure of the set of arguments of a function f for which f is not zero.

A real-linear vector space H equipped with a symplectic form s.

A system of equations is any set of simultaneous equations.

A tangent point of two similar curves.

A vector field is a section of its tangent bundle, meaning that to every point x in a manifold M, a vector X(x) in T_xM is associated, where T_x is the tangent space.

Two curves are tangent externally at a point P if they lie on opposite sides of their common tangent at P

Two curves are tangent internally at a point P if they lie on the same side of their common tangent at P