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negbT: forall [b : bool], b = false -> ~~ b
contra_notN: forall [P : Prop] [b : bool], (b -> P) -> ~ P -> ~~ b
contraPN: forall [P : Prop] [b : bool], (b -> ~ P) -> P -> ~~ b
contraNN: forall [c b : bool], (c -> b) -> ~~ b -> ~~ c
contraL: forall [c b : bool], (c -> ~~ b) -> b -> ~~ c
contraTN: forall [c b : bool], (c -> ~~ b) -> b -> ~~ c
contra: forall [c b : bool], (c -> b) -> ~~ b -> ~~ c
introN: forall [P : Prop] [b : bool], reflect P b -> ~ P -> ~~ b
contraFN: forall [c b : bool], (c -> b) -> b = false -> ~~ c
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