Logic / Unit 5 Logic 205 short lesson, about 20 seconds
Commutativity
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The idea
p ∨ q :: q ∨ p, and p · q :: q · p.
In practice
Order doesn't matter for ∨ and ·.
Where people slip
It matters enormously for ⊃. No commuting conditionals — that's video 150 wearing a rule's clothing.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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