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Theorem nn0nepnf 9617
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 8357 . . . . 5 +∞ ∉ ℝ
21neli 2517 . . . 4 ¬ +∞ ∈ ℝ
3 nn0re 9551 . . . 4 (+∞ ∈ ℕ0 → +∞ ∈ ℝ)
42, 3mto 672 . . 3 ¬ +∞ ∈ ℕ0
5 eleq1 2301 . . 3 (𝐴 = +∞ → (𝐴 ∈ ℕ0 ↔ +∞ ∈ ℕ0))
64, 5mtbiri 686 . 2 (𝐴 = +∞ → ¬ 𝐴 ∈ ℕ0)
76necon2ai 2474 1 (𝐴 ∈ ℕ0𝐴 ≠ +∞)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1402  wcel 2209  wne 2420  cr 8168  +∞cpnf 8347  0cn0 9542
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-un 4573  ax-cnex 8260  ax-resscn 8261  ax-1re 8263  ax-addrcl 8266  ax-rnegex 8278
This theorem depends on definitions:  df-bi 117  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-uni 3931  df-int 3966  df-pnf 8352  df-inn 9284  df-n0 9543
This theorem is referenced by:  nn0nepnfd  9619  xnn0nnen  10852  fxnn0nninf  10854  0tonninf  10855  1tonninf  10856
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