According to Karl Popper, fact is any claim?, assertion, allegation?, belief? or other utterance? that is posed in such a way as be theoretically falsifiable. That is, there is some thought experiment? by which the claim could be tested and shown to be false, beyond any dispute. The scientific method? relies only upon such statements.

E Prime is a set of linguistic conventions, or a designed language?, that avoids use of the verb to be in order to require more factual statements.

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