%query: p(i,o). %TWTYPES :- type p(dt,exp). p(d(e(t)), const(1)). p(d(e(const(A))), const(0)). p(d(e(X+Y)), DX+DY) :- p(d(e(X)),DX), p(d(e(Y)),DY). p(d(e(X*Y)), X*DY + Y*DX) :- p(d(e(X)),DX), p(d(e(Y)),DY). p(d(d(X)),DDX) :- p(d(X),DX), p(d(e(DX)),DDX). /*TWDESC Contrived example */ /*TWTYPES dt(d(X)) :- dt(X). dt(e(X)) :- exp(X). exp(t). exp(const(X)) :- num(X). exp(+(X,Y)) :- exp(X), exp(Y). exp(*(X,Y)) :- exp(X), exp(Y). num(0). num(1). */ /*TWDEMO selected_norms([dt,exp,num]). query(p(b,b,f,f,f)). */
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