http://en.wikipedia.org/wiki/Informal_fallacy http://en.wikipedia.org/wiki/Informal_fallacy "The problem with an informal fallacy often stems from a flaw in re

http://en.wikipedia.org/wiki/Informal_fallacy http://en.wikipedia.org/wiki/Informal_fallacy "The problem with an informal fallacy often stems from a flaw in reasoning that renders the conclusion unpersuasive. In contrast to a formal fallacy of deduction, the error is not merely a flaw in logic."