Created
May 7, 2019 14:00
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| betaC(L, R) :- var(L), !, L=R. | |
| betaC(app(X, Y), R) :- !, betaC(X, XX), betaC(Y, YY), app(XX,YY,R). | |
| /* for head normal form: betaC(lam(X, Y), R) :- !, R = lam(X, Y).*/ | |
| betaC(lam(X, Y), R) :- !, betaC(Y, YY), R = lam(X, YY). | |
| betaC(L, R) :- L =.. [H|A], maplist(betaC, A, AA), R =.. [H|AA]. | |
| app(I, Y, R) :- nonvar(I), I = lam(X, F), !, alphaConvert(Y, X), betaC(F, R). | |
| app(X, Y, app(X,Y)). |
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