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Logical Operators

Disjunction (or)

Any two propositions P and Q can be disjoined, producing the new, complex, proposition:

    P or Q

The proposition P and Q is true if and only if either P or Q are true. It is false only if both P and Q are false.

Examples

P

Q  P or Q
T T   T
T F   T
F T   T
F F   F