The condition and the major term are "equipollent" in their extension.
At first, ‘spirit and matter,’ ‘soul and body,’ stood for a pair of equipollent substances quite on a par in weight and interest.
Equipollent, e-kwi-pol′ent, adj. having equal power or force: equivalent.
Hill's eloquence exceeded his judgment; Stephens' judgment was superior to his oratorical power; in Toombs these were equipollent.
But, since is and exists are equipollent, and so being and existing, is being is the same as the unimpeachable is existing.