/** Helper method for groundedUnify. */
private boolean groundedUnify(APLVar t, SubstList<Term> theta) {
Term subst = theta.get(t.getName());
if (subst != null) return groundedUnify(subst, theta);
else {
theta.put(t.getName(), this);
return true;
}
}
/**
* Test whether this number is equal to another number.
*
* @param other the number to compare with
* @return true if equal, false otherwise
*/
public boolean equals(Term other) {
if (other instanceof APLNum) {
APLNum term = (APLNum) other;
return val.equals(term.getVal());
} else if (other instanceof APLVar) {
APLVar term = (APLVar) other;
if (!term.isBounded()) return false;
else return equals(term.getSubst());
} else return false;
}