/* There are many special variables in Maxima: more than 250 are used for options, for example */
fpprec;  /* precision for big floats */
obase;   /* number base for output */

/* Other variables are read-only, and give the list of user-defined variables, functions... */
infolists; /* give the names of all available lists */
[labels, values, functions, macros, arrays, myoptions, props, aliases, rules, gradefs, dependencies, let_rule_packages, structures]