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Line 128: ===Covariants of two quadratics and a linear form=== ==Covariants of several linear and quadratic forms== The ring of invariants of a sum of ''m'' linear forms and ''n'' quadratic forms is generated by ''m''(''m''–1)/2 + ''n''(''n''+1)/2 generators in degree 2, ''nm ''(''m''+1)/2 + ''n''(''n''–1)(''n''–2)/6 in degree 3, and m''(''m''+1)''n''(''n ''–1)/4 in degree 4. For the number of generators of the ring of covariants, change ''m'' to ''m''+1. ===Covariants of a quadratic and a cubic===

Invariant of a binary form: Difference between revisions