Description: The natural numbers of
analysis start at one (unlike the ordinal natural
numbers, i.e. the members of the set , df-om 4086, which start at
zero). This is the convention used by most analysis books, and it is
often convenient in proofs because we don't have to worry about division
by zero. See nnind 7453 for the principle of mathematical induction.
See
dfnn2 7452 for a slight variant. See df-n0 7649 for the set of nonnegative
integers
starting at zero. See dfn2 7661 for defined in
terms of . |