is a specific kind of: certainty, foregone conclusion, sure thing.

is a broader term that covers: incontrovertibility, incontrovertibleness, positiveness, positivity | demonstrability, provability | givenness.

derivation: indisputable, sure | incontestable, indisputable, undisputable | unquestionable | authentic, bona fide, unquestionable, veritable | unquestionable | beyond doubt, indubitable.