public boolean isGTOrdered(final IExpr obj) { return compareTo(obj) > 0; }
public boolean isGEOrdered(final IExpr obj) { return compareTo(obj) >= 0; }
public boolean isLTOrdered(final IExpr obj) { return compareTo(obj) < 0; }
public boolean isLEOrdered(final IExpr obj) { return compareTo(obj) <= 0; }