Evidence of absence

（重定向自Negative evidence）

Evidence of absence is evidence of any kind that suggests something is missing or that it does not exist. For example:

Since it necessarily follows from the first premise that Alice will place the pie on her window-sill every time she bakes one, upon observing that there is in fact no pie on the window-sill, we can deduce that Alice did not bake a pie. This argument is called modus tollens in propositional logic, and is written in sequent notation in this manner:

单词	Negative evidence
释义	Negative evidence 原声例句物种起源 In all cases positive palaeontological evidence may be implicitly trusted; negative evidence is worthless, as experience has so often shown. 在所有情况下，积极的古生物学证据都可能是绝对可信的；正如经验经常表明的那样，负面证据毫无价值。英语百科 Evidence of absence （重定向自Negative evidence） Evidence of absence is evidence of any kind that suggests something is missing or that it does not exist. For example: Since it necessarily follows from the first premise that Alice will place the pie on her window-sill every time she bakes one, upon observing that there is in fact no pie on the window-sill, we can deduce that Alice did not bake a pie. This argument is called modus tollens in propositional logic, and is written in sequent notation in this manner:
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