If I try to do: (%i10) 1000!+1; it works, while if I try this, I get an error message, (%i10) 1000!+0.1; Maxima encountered a Lisp error: Error in PROGN [or a callee]: Can't print a non-number. Automatically continuing. To enable the Lisp debugger set *debugger-hook* to nil. why?