Nuprl Lemma : fpf-is-empty_wf
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A
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Top. fpf-is-empty(
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A:Type, f:x:A fp
Top. fpf-is-empty(f) 
A:Type, f:x:A fp Top. fpf-is-empty(f) 
x. t(x) B(a)jx:A. B(x) T