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Theorem nn0nepnf 9571
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 8315 . . . . 5 +∞ ∉ ℝ
21neli 2509 . . . 4 ¬ +∞ ∈ ℝ
3 nn0re 9505 . . . 4 (+∞ ∈ ℕ0 → +∞ ∈ ℝ)
42, 3mto 668 . . 3 ¬ +∞ ∈ ℕ0
5 eleq1 2295 . . 3 (𝐴 = +∞ → (𝐴 ∈ ℕ0 ↔ +∞ ∈ ℕ0))
64, 5mtbiri 682 . 2 (𝐴 = +∞ → ¬ 𝐴 ∈ ℕ0)
76necon2ai 2466 1 (𝐴 ∈ ℕ0𝐴 ≠ +∞)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1398  wcel 2203  wne 2412  cr 8126  +∞cpnf 8305  0cn0 9496
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 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-un 4554  ax-cnex 8218  ax-resscn 8219  ax-1re 8221  ax-addrcl 8224  ax-rnegex 8236
This theorem depends on definitions:  df-bi 117  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-rab 2529  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-uni 3915  df-int 3950  df-pnf 8310  df-inn 9238  df-n0 9497
This theorem is referenced by:  nn0nepnfd  9573  xnn0nnen  10799  fxnn0nninf  10801  0tonninf  10802  1tonninf  10803
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