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At:
diagonalization wrt eq B:Type, e:(BB).
(b:B. e(b) = b)
(A:Type, f:(AAB). (a:A. (Diag f wrt x. e(x)) = f(a)))
By:
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)))) ;
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