Simplest examples of a contingency, a tautology, and a contradiction
p ?p p ? ?p p ? ?p
T
F
F
T
T
T
F
F
“Hancy is mancy”
“Hancy is mancy or hancy is not mancy”
“Hancy is mancy and hancy is not mancy”
--- can be true, can be false
--- true
--- false
1.2
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