f_lambda not
f_lambda listp list?
f_lambda pairp pair?
-f_lambda numberp number? integer?
+f_lambda integerp integer? exact? exact-integer?
+f_lambda numberp number? real?
f_lambda booleanp boolean?
f_lambda set_car set-car!
f_lambda set_cdr set-cdr!
f_lambda current_jiffy current-jiffy
f_lambda current_second current-second
f_lambda jiffies_per_second jiffies-per-second
+f_lambda finitep finite?
+f_lambda infinitep infinite?
+f_lambda inexactp inexact?
+f_lambda sqrt