In mathematical invariant theory, an evectant is a contravariant constructed from an invariant by acting on it with a differential operator called an evector. Evectants and evectors were introduced by Sylvester (1854, p.95).
References
Sylvester, James Joseph (1853), "On the calculus of forms, otherwise the theory of invariants", The Cambridge and Dublin Mathematical Journal, 8: 257–269
Sylvester, James Joseph (1854), "On the calculus of forms, otherwise the theory of invariants", The Cambridge and Dublin Mathematical Journal, 9: 85–103
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