qeq(r; s)
== if isint(r)
== then if isint(s) then (r =s) else let i,j = s in (r * j =i) fi
== else let p,q = r in if isint(s) then (p =s * q) else let i,j = s in (p * j =i * q) fi
== fi
qeq(r; s)
== if isint(r;tt;ff)
== then if isint(s;tt;ff) then (r =s) else let i,j = s in (r * j =i) fi
== else let p,q = r in if isint(s;tt;ff) then (p =s * q) else let i,j = s in (p * j =i * q) fi
== fi