The Latin phrase falsum in uno, falsum in omnibus which, roughly translated, means “false in one thing, false in everything“, is fallacious in so far as someone found to be wrong about one thing, is presumed to be wrong about some other thing entirely. Arising in Roman courts, this principle meant that if a witness was proved false in some parts of his testimony, any further statements were also regarded as false unless they were independently corroborated. Falsum is thus a fallacy of logic. The description that an initial false statement is a prelude to the making of more false statements is false; however, even one false premise will suffice to disprove an argument. 

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