/** Order term function (for truncated power series). */
DECLARE_FUNCTION_1P(Order)
-ex lsolve(const ex &eqns, const ex &symbols);
+ex lsolve(const ex &eqns, const ex &symbols, unsigned options = determinant_algo::automatic);
/** Check whether a function is the Order (O(n)) function. */
inline bool is_order_function(const ex & e)