A self-evident truth or proposition, that cannot be made plainer by demonstration.
Аксиома
An axiom is a sentence, or relation, in a logic system that is assumed to be true. some familiar examples would be the axioms of euclidan geometry or kolmogorov`s axioms of probability. a more prosaic example would be the axiom that "all animals have a mother and a father" in a genetics tracking system (e.g., boblo). see also: assertion, boblo.