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Theorem nn0nepnf 9588
Description: No standard nonnegative integer equals positive infinity. (Contributed by AV, 10-Dec-2020.)
Assertion
Ref Expression
nn0nepnf (𝐴 ∈ ℕ0𝐴 ≠ +∞)

Proof of Theorem nn0nepnf
StepHypRef Expression
1 pnfnre 8331 . . . . 5 +∞ ∉ ℝ
21neli 2511 . . . 4 ¬ +∞ ∈ ℝ
3 nn0re 9522 . . . 4 (+∞ ∈ ℕ0 → +∞ ∈ ℝ)
42, 3mto 668 . . 3 ¬ +∞ ∈ ℕ0
5 eleq1 2297 . . 3 (𝐴 = +∞ → (𝐴 ∈ ℕ0 ↔ +∞ ∈ ℕ0))
64, 5mtbiri 682 . 2 (𝐴 = +∞ → ¬ 𝐴 ∈ ℕ0)
76necon2ai 2468 1 (𝐴 ∈ ℕ0𝐴 ≠ +∞)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1398  wcel 2205  wne 2414  cr 8142  +∞cpnf 8321  0cn0 9513
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-un 4559  ax-cnex 8234  ax-resscn 8235  ax-1re 8237  ax-addrcl 8240  ax-rnegex 8252
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-rab 2531  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-uni 3920  df-int 3955  df-pnf 8326  df-inn 9255  df-n0 9514
This theorem is referenced by:  nn0nepnfd  9590  xnn0nnen  10823  fxnn0nninf  10825  0tonninf  10826  1tonninf  10827
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