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Theorem pnfnre 8367
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 cnex 8303 . . . . . 6 ℂ ∈ V
21uniex 4583 . . . . 5 ℂ ∈ V
3 pwuninel2 6553 . . . . 5 ( ℂ ∈ V → ¬ 𝒫 ℂ ∈ ℂ)
42, 3ax-mp 5 . . . 4 ¬ 𝒫 ℂ ∈ ℂ
5 df-pnf 8362 . . . . 5 +∞ = 𝒫
65eleq1i 2304 . . . 4 (+∞ ∈ ℂ ↔ 𝒫 ℂ ∈ ℂ)
74, 6mtbir 682 . . 3 ¬ +∞ ∈ ℂ
8 recn 8312 . . 3 (+∞ ∈ ℝ → +∞ ∈ ℂ)
97, 8mto 672 . 2 ¬ +∞ ∈ ℝ
109nelir 2518 1 +∞ ∉ ℝ
Colors of variables:    wff set class
This proof depends on syntax axioms:  ¬ wn 3  wcel 2209  wnel 2515  Vcvv 2821  𝒫 cpw 3688   cuni 3935  cc 8177  cr 8178  +∞cpnf 8357
This proof depends on 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 4249  ax-un 4578  ax-cnex 8270  ax-resscn 8271
This proof 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-nel 2516  df-rex 2534  df-rab 2537  df-v 2823  df-in 3226  df-ss 3233  df-pw 3690  df-uni 3936  df-pnf 8362
This theorem is used by:  renepnf  8373  nn0nepnf  9638  xrltnr  10181  pnfnlt  10189  xnn0lenn0nn0  10267  inftonninf  10879  pcgcd1  13107  pc2dvds  13109
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