Question

what is fundamental system?​

Answer 1

A set of algebraic invariants for a quantic such that any invariant of the quantic is expressible as a polynomial in members of the set. Gordan (1868) proved the existence of finite fundamental systems of algebraic invariants and covariants for any binary quadratic form, which in modern terminology would be stated that every binary quadratic form has a finite Hilbert basis. The complete systems of the quintic and sextic were also first obtained by Gordan in 1868. Hilbert (1890) subsequently proved the general Hilbert basis theorem, which is a finiteness theorem for the related concept of syzygies.

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