Mathematics . a theoretical proposition, statement, or formula embodying something to be proved from other propositions or formulas.

a rule or law, esp. one expressed by an equation or formula.

Logic . a proposition that can be deduced from the premises or assumptions of a system.

an idea, belief, method, or statement generally accepted as true or worthwhile without proof.

noun

fact , proof

noun

assumption , axiom , belief , deduction , dictum , doctrine , formula , fundamental , law , postulate , principium , principle , proposition , rule , statement , theory , thesis , universal , hypothesis