Stepping on the pebbles of life, one at a time.
Also, if A is a collection of natural numbers, A contains all the natural numbers if...
(1) 1 is in the set of A
(2) k+1 is in the set of A whenever k is in A
Also, if A is a collection of natural numbers, A contains all the natural numbers if...
(1) 1 is in the set of A
(2) k+1 is in the set of A whenever k is in A