Logic / Unit 1 Logic 025 short lesson, about 20 seconds
Argument Structure: Serial, Convergent, Linked
Captions available
The idea
Premises can chain (serial: A supports B supports C), independently support one conclusion (convergent), or work only together (linked).
In practice
"He has a fever" and "he has a rash" converge on "he's sick." "All fish have gills" and "trout are fish" are linked — each is useless alone.
Where people slip
Knocking out one convergent premise leaves the rest standing. Knocking out one linked premise fells the whole structure.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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