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At:
diagonalization wrt eq1 1. B : Type
2. e : BB 3. b:B. e(b) = b 4. A : Type
5. f : AAB (a:A. (Diag f wrt x. e(x)) = f(a))
By:
Inst:
Thm*R:(BBProp), e:(BB).
Thm* (b:B. R(e(b),b))
Thm*
Thm* (A:Type, f:(AAB). (a:A. R((Diag f wrt x. e(x))(a),f(a,a))))
Using:[B | R(x,y):= x = yB | e | A | f]