Logic / Unit 8 Logic 377 short lesson, about 20 seconds
Formal vs. Informal Fallacies
Captions available
The idea
Formal fallacies fail by structure alone (150, 152, 155, 102). Informal fallacies require looking at content and context.
In practice
Affirming the consequent fails on any subject matter. A weak analogy fails on this subject matter.
Where people slip
This unit is the informal catalog. The formal ones already have numbers — that's what "formal" means.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
- Nothing yet depends on this.
Something wrong in this lesson? Flag it · Sources for Logic