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Answer for the clue "Like certain math propositions ", 10 letters:
unprovable

Word definitions for unprovable in dictionaries

WordNet Word definitions in WordNet
adj. not provable; "it was both unproved and unprovable"

Wiktionary Word definitions in Wiktionary
a. That cannot be proved or verified by any test

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
early 15c., from un- (1) "not" + provable (adj.).

Usage examples of unprovable.

Worst of all, RSA depends upon the unprovable mathematical hypothesis that there is no polynomial time bounded algorithm for factoring numbers.