MathExpressionEntityMethodRef enprop = (MathExpressionEntityMethodRef)exp;
if(enprop.getRef().equals(prop)) {
return true;
}
} else if(exp instanceof MathExpressionComplex) {
MathExpressionComplex cx = (MathExpressionComplex) exp;
MathExpressionList list = cx.getChildren();
for(int i=0; i<list.size(); i++) {
if((list.get(i) instanceof MathExpressionOperand)) {
MathExpressionOperand operand = (MathExpressionOperand) list.get(i);
if(isContainProperty(operand, prop)) {
return true;