>[!abstract] >While a logical argument is a non sequitur if, and only if, it is invalid, the term "non sequitur" typically refers to those types of invalid arguments which do not constitute formal fallacies covered by particular terms (e.g., affirming the consequent). In other words, in practice, "non sequitur" refers to an unnamed formal fallacy (Wikipedia, 2025). >[!related] >- **North** (upstream): [[Logical fallacies]] >- **West** (similar): [[Red herring]] >- **East** (different): [[Valid inference]] >- **South** (downstream): [[Irrelevant conclusion]] (ignoratio elenchi)