In mathematical invariant theory, the osculant or tacinvariant or tact invariant is an invariant of a hypersurfaces that vanishes if the
Kaynak: Osculant

osculant , an invariant of hypersurfaces. osculating circle osculating curve osculating plane osculating orbit osculation The obsolete
Kaynak: Osculate

osculant osculant An invariant of several forms of the same degree generalizing the tact-invariant of two forms, equal to the discriminant
Kaynak: Glossary of invariant theory