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Theorem pnfnre 9960
Description: Plus infinity is not a real number. (Contributed by NM, 13-Oct-2005.)
Assertion
Ref Expression
pnfnre +∞ ∉ ℝ

Proof of Theorem pnfnre
StepHypRef Expression
1 pwuninel 7288 . . . 4 ¬ 𝒫 ℂ ∈ ℂ
2 df-pnf 9955 . . . . 5 +∞ = 𝒫
32eleq1i 2679 . . . 4 (+∞ ∈ ℂ ↔ 𝒫 ℂ ∈ ℂ)
41, 3mtbir 312 . . 3 ¬ +∞ ∈ ℂ
5 recn 9905 . . 3 (+∞ ∈ ℝ → +∞ ∈ ℂ)
64, 5mto 187 . 2 ¬ +∞ ∈ ℝ
76nelir 2886 1 +∞ ∉ ℝ
Colors of variables: wff setvar class
Syntax hints:  wcel 1977  wnel 2781  𝒫 cpw 4108   cuni 4372  cc 9813  cr 9814  +∞cpnf 9950
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-resscn 9872
This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-nel 2783  df-rex 2902  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-pw 4110  df-sn 4126  df-pr 4128  df-uni 4373  df-pnf 9955
This theorem is referenced by:  renepnf  9966  ltxrlt  9987  nn0nepnf  11248  xrltnr  11829  pnfnlt  11838  hashclb  13011  hasheq0  13015  pcgcd1  15419  pc2dvds  15421  ramtcl2  15553  odhash3  17814  xrsdsreclblem  19611  pnfnei  20834  iccpnfcnv  22551  i1f0rn  23255
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