Glossary of invariant theory

This page is a glossary of terms in invariant theory. 
For descriptions of particular invariant rings, see invariants of a binary form, symmetric polynomials. 
For geometric terms used in invariant theory see the glossary of classical algebraic geometry. 
Definitions of many terms used in invariant theory can be found in , , , , , , , , and the index to the fourth volume of Sylvester's collected works includes many of the terms invented by him.
H.
 