+ made it so that you can use the mnemonics

(add, sub, mul, div) in lieu of (+, -, *, /)

math.c

@@ -93,9 +93,13 @@ struct op {
 
 static const struct op operators[] = {
 	{"+",   add},
+	{"add", add},
 	{"-",   sub},
+	{"sub", sub},
 	{"*",   mul},
+	{"mul", mul},
 	{"/",   divide},
+	{"div", divide},
 	{"and", and},
 	{"or",  or},
 	{"not", not},