<P> Sometimes a conjecture is called a hypothesis when it is used frequently and repeatedly as an assumption in proofs of other results . For example, the Riemann hypothesis is a conjecture from number theory that (amongst other things) makes predictions about the distribution of prime numbers . Few number theorists doubt that the Riemann hypothesis is true . In anticipation of its eventual proof, some have proceeded to develop further proofs which are contingent on the truth of this conjecture . These are called conditional proofs: the conjectures assumed appear in the hypotheses of the theorem, for the time being . </P> <P> These "proofs", however, would fall apart if it turned out that the hypothesis was false, so there is considerable interest in verifying the truth or falsity of conjectures of this type . </P> <P> Karl Popper pioneered the use of the term "conjecture" in scientific philosophy . Conjecture is related to hypothesis, which in science refers to a testable conjecture . </P>

An unproven statement about a problem that is testable is called
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