Negative proof
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The fallacy of negative proof is a type of logical fallacy of the following form:
- "No one has produced an example of one; therefore it doesn't exist."
While the assertion has some strength as an epistemic directive, logically it has none. Logically one may argue that just because we have not observed a particular phenomenon, that is no reason to exclude its possibility. The epistemological slant though is to require a demonstration, before one admits that one is compelled to admit the phenomenon as real.
The problem with the argument is precisely that it has no logical force, but is nevertheless a necessary guiding principle for scientists.
On the converse someone disputing the ancestry of man amongst the lower apes; will invariably point to the lack of demonstrated intermediary stages (the missing link). The often used rejoinder to this and other similar proffered arguments is: "Absence of evidence is not evidence of absence!"
A proper resolution of these conflicting uses is a delicate task.