Def b == if b false else true fi

is mentioned by

Thm* T:S, P:(T). (x:T. P(x)) = (x:T. P(x))	[bnot_ball]
Thm* T:S, P:(T). (x:T. P(x)) = (x:T. P(x))	[bnot_bexists]

In prior sections: bool 1

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