A formal fallacy is an argument whose conclusion could be false.

Evidence

A formal fallacy is any violation of any of the six rules of the categorical syllogism or the rules of the hypothetical or disjunctive-alternative syllogism. It is an argument whose conclusion could be false even if all its premises are true. It can be detected merely by examining the form (hence its name) or structure of the argument. — Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide to Clear…, 773

Categorization

• corroborated: 2 independent passages support this claim — Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide to Clear…, 773
• XREF: connects to: Logicians and lawyers use fallacy to mean incorrect argument. — Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide to Clear…, 771; A fallacy is an argument that seems valid but fails logic — Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide to Clear…, 776

Broader Connections

• A fallacy is an argument that seems valid but fails logic #expands (0.60) — Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide to Clear…, 776