determines if the given expression is independent of any variable . an independent expression guarantee not to throw any exception . concode_field_sep int POW concode_elem_sep int ADD concode_elem_sep int MUL concode_elem_sep int FUNC concode_field_sep boolean isVar concode_elem_sep boolean isNum concode_elem_sep int getPrecedence concode_elem_sep boolean isConst concode_elem_sep boolean isMul concode_elem_sep boolean isLog concode_elem_sep boolean isFrac concode_elem_sep boolean isAdd concode_elem_sep boolean isSub concode_elem_sep Expression simplify concode_elem_sep String asString concode_elem_sep String asString concode_elem_sep boolean isExp
boolean function ( Expression arg0 ) { return ( arg0 instanceof ConstantNode ) || ( arg0 instanceof NumberNode ) ; }