Theorem nnnn0i 9122

Description: A positive integer is a nonnegative integer. (Contributed by NM, 20-Jun-2005.)

Hypothesis

Ref	Expression
nnnn0.1	|- N e. NN

Assertion

Ref	Expression
nnnn0i	|- N e. NN0

Proof of Theorem nnnn0i

Step	Hyp	Ref	Expression
1		nnnn0.1	. 2 |- N e. NN
2		nnnn0 9121	. 2 |- ( N e. NN -> N e. NN0 )
3	1, 2	ax-mp 5	1 |- N e. NN0

Syntax hints:   e. wcel 2136   NNcn 8857   NN0cn0 9114

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147

This theorem depends on definitions:  df-bi 116  df-tru 1346  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-v 2728  df-un 3120  df-in 3122  df-ss 3129  df-n0 9115

This theorem is referenced by:  1nn0  9130  2nn0  9131  3nn0  9132  4nn0  9133  5nn0  9134  6nn0  9135  7nn0  9136  8nn0  9137  9nn0  9138  numlt  9346  declei  9357  numlti  9358  pockthi  12288