Theorem nn0nepnf 9463

Description: No standard nonnegative integer equals positive infinity. (Contributed by AV, 10-Dec-2020.)

Assertion

Ref	Expression
nn0nepnf	|- ( A e. NN0 -> A =/= +oo )

Proof of Theorem nn0nepnf

Step	Hyp	Ref	Expression
1		pnfnre 8211	. . . . 5 |- +oo e/ RR
2	1	neli 2497	. . . 4 |- -. +oo e. RR
3		nn0re 9401	. . . 4 |- ( +oo e. NN0 -> +oo e. RR )
4	2, 3	mto 666	. . 3 |- -. +oo e. NN0
5		eleq1 2292	. . 3 |- ( A = +oo -> ( A e. NN0 <-> +oo e. NN0 ) )
6	4, 5	mtbiri 679	. 2 |- ( A = +oo -> -. A e. NN0 )
7	6	necon2ai 2454	1 |- ( A e. NN0 -> A =/= +oo )

Syntax hints:   -> wi 4   = wceq 1395   e. wcel 2200   =/= wne 2400   RRcr 8021   +oocpnf 8201   NN0cn0 9392

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-un 4528  ax-cnex 8113  ax-resscn 8114  ax-1re 8116  ax-addrcl 8119  ax-rnegex 8131

This theorem depends on definitions:  df-bi 117  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-ral 2513  df-rex 2514  df-rab 2517  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-uni 3892  df-int 3927  df-pnf 8206  df-inn 9134  df-n0 9393

This theorem is referenced by:  nn0nepnfd  9465  xnn0nnen  10689  fxnn0nninf  10691  0tonninf  10692  1tonninf  10693