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There are 8 basic invariants (3 of degree 2, 4 of degree 3, and 1 of degree 4) and 28 basic covariants. (Gordan gave 30 covariants, but Sylvester showed that two of these are reducible.)
===Covariants of many cubics or quartics===
The numbers of generators of invariants or covariants were given by {{harvtxt|Young|1899}}.
==See also==
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