/* Maxima has inf (positive infinity) and minf (negative infinity) */

declare(x, real)$

is(x < inf);
/* true */

is(x > minf);
/* true */

/* However, it is an error to try to divide by zero, even with floating-point numbers */
1.0/0.0;
/* expt: undefined: 0 to a negative exponent.
   -- an error. To debug this try: debugmode(true); */