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Theorem pnfnre 11307
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 df-pnf 11302 . . . 4 +∞ = 𝒫
2 pwuninel 8271 . . . 4 ¬ 𝒫 ℂ ∈ ℂ
31, 2eqneltri 2879 . . 3 ¬ +∞ ∈ ℂ
4 recn 11247 . . 3 (+∞ ∈ ℝ → +∞ ∈ ℂ)
53, 4mto 200 . 2 ¬ +∞ ∈ ℝ
65nelir 3064 1 +∞ ∉ ℝ
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wcel 2145  wnel 3061  𝒫 cpw 4557   cuni 4867  cc 11155  cr 11156  +∞cpnf 11297
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2732  ax-sep 5249  ax-resscn 11214
This proof depends on definitions:  df-bi 210  df-an 402  df-3an 1105  df-tru 1573  df-ex 1813  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-nel 3062  df-rab 3413  df-v 3452  df-in 3906  df-ss 3916  df-pw 4559  df-uni 4868  df-pnf 11302
This theorem is used by:  pnfnre2  11308  renepnf  11314  ltxrlt  11337  nn0nepnf  12642  xrltnr  13203  pnfnlt  13212  xnn0lenn0nn0  13330  hashclb  14455  hasheq0  14460  pcgcd1  17002  pc2dvds  17004  ramtcl2  17136  odhash3  19737  xrsdsreclblem  21666  pnfnei  23485  iccpnfcnv  25212  i1f0rn  25950
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