DiscreteMath Sections DiscrMathExt Doc
IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
Def  IsEqFun(T;eq) == x,y:T(x eq y x = y

is mentioned by

Thm*  e:(BB). 
Thm*  IsEqFun(B;e)
Thm*  
Thm*  (a:f:(a onto B). (y.least x:. (f(x)) e y B inj a)
[nsub_surj_imp_a_rev_inj_gen]
Thm*  e:(BB). 
Thm*  IsEqFun(B;e (a:f:(a onto B), y:Bf(least x:. (f(x)) e y) = y)
[nsub_surj_least_preimage_works_gen]
Thm*  e:(BB). 
Thm*  IsEqFun(B;e (a:f:(a onto B), y:B. (least x:. (f(x)) e y a)
[nsub_surj_least_preimage_total_gen]
Thm*  IsEqFun(b;i,ji=j)[eq_int_is_eq_nsub]

In prior sections: rel 1 LogicSupplement

Try larger context: DiscrMathExt IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html

DiscreteMath Sections DiscrMathExt Doc