A fallacy is generally considered to be an error in reasoning. It refers both to the failure to apply logic to a line of thought, and to the use of problematic arguments. The term can be applied when dealing both with informal and formal logic, although it usual refers to the former.

Related: Disagreement, Heuristics & Biases

Informal vs Formal Fallacy

An informal fallacy refers to a flawed argument, where the premises do not support the conclusion. It can, however, have a valid logical format. This type of fallacy is commonly divided in two main groups: material fallacies and verbal fallacies....

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