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Theorem pnfnre 7831
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 7768 . . . . . 6 ℂ ∈ V
21uniex 4367 . . . . 5 ℂ ∈ V
3 pwuninel2 6187 . . . . 5 ( ℂ ∈ V → ¬ 𝒫 ℂ ∈ ℂ)
42, 3ax-mp 5 . . . 4 ¬ 𝒫 ℂ ∈ ℂ
5 df-pnf 7826 . . . . 5 +∞ = 𝒫
65eleq1i 2206 . . . 4 (+∞ ∈ ℂ ↔ 𝒫 ℂ ∈ ℂ)
74, 6mtbir 661 . . 3 ¬ +∞ ∈ ℂ
8 recn 7777 . . 3 (+∞ ∈ ℝ → +∞ ∈ ℂ)
97, 8mto 652 . 2 ¬ +∞ ∈ ℝ
109nelir 2407 1 +∞ ∉ ℝ
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wcel 1481  wnel 2404  Vcvv 2689  𝒫 cpw 3515   cuni 3744  cc 7642  cr 7643  +∞cpnf 7821
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4054  ax-un 4363  ax-cnex 7735  ax-resscn 7736
This theorem depends on definitions:  df-bi 116  df-tru 1335  df-fal 1338  df-nf 1438  df-sb 1737  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-nel 2405  df-rex 2423  df-rab 2426  df-v 2691  df-in 3082  df-ss 3089  df-pw 3517  df-uni 3745  df-pnf 7826
This theorem is referenced by:  renepnf  7837  nn0nepnf  9072  xrltnr  9596  pnfnlt  9603  xnn0lenn0nn0  9678  inftonninf  10245
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