Hi all, solve([a=b,b=3],[a]) produces " Maxima encountered a Lisp error: Error during processing of --eval option "(cl-user::run)": The value 2 is not of type LIST. Automatically continuing. To reenable the Lisp debugger set *debugger-hook* to nil. " I think solve should work also when the number of equations is different from the number of unknowns. Fabrizio