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Translating "Unless"

This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.

State

"p unless q" translates as p ∨ q.

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"I'll walk unless it rains" — W ∨ R. Equivalently: ~R ⊃ W.

Watch for

Resist the urge to over-read: "unless" ordinarily doesn't promise what happens if it rains. That extra promise is the exclusive reading, and it needs explicit warrant.

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