rational numbers, 139
rational?, 130, 139
rationalize, 149
read, 173
read-char, 174
real numbers, 139
real-part, 149
real?, 130, 139
rec, 200
reciprocal, 15, 35, 37, 77
recursion, 5, 39, 62, 100
recursion step, 40
recursive procedure, 40
remainder, 145
remv, 42
retry, 73, 77
reverse, 137
Revised Reports, ix, 3
round, 146
round-robin, 253