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Theorem xrnepnf 13161
Description: An extended real other than plus infinity is real or negative infinite. (Contributed by Mario Carneiro, 20-Aug-2015.)
Assertion
Ref Expression
xrnepnf ((𝐴 ∈ ℝ*𝐴 ≠ +∞) ↔ (𝐴 ∈ ℝ ∨ 𝐴 = -∞))

Proof of Theorem xrnepnf
StepHypRef Expression
1 pm5.61 1002 . 2 ((((𝐴 ∈ ℝ ∨ 𝐴 = -∞) ∨ 𝐴 = +∞) ∧ ¬ 𝐴 = +∞) ↔ ((𝐴 ∈ ℝ ∨ 𝐴 = -∞) ∧ ¬ 𝐴 = +∞))
2 elxr 13159 . . . 4 (𝐴 ∈ ℝ* ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞))
3 df-3or 1087 . . . 4 ((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) ↔ ((𝐴 ∈ ℝ ∨ 𝐴 = +∞) ∨ 𝐴 = -∞))
4 or32 925 . . . 4 (((𝐴 ∈ ℝ ∨ 𝐴 = +∞) ∨ 𝐴 = -∞) ↔ ((𝐴 ∈ ℝ ∨ 𝐴 = -∞) ∨ 𝐴 = +∞))
52, 3, 43bitri 297 . . 3 (𝐴 ∈ ℝ* ↔ ((𝐴 ∈ ℝ ∨ 𝐴 = -∞) ∨ 𝐴 = +∞))
6 df-ne 2940 . . 3 (𝐴 ≠ +∞ ↔ ¬ 𝐴 = +∞)
75, 6anbi12i 628 . 2 ((𝐴 ∈ ℝ*𝐴 ≠ +∞) ↔ (((𝐴 ∈ ℝ ∨ 𝐴 = -∞) ∨ 𝐴 = +∞) ∧ ¬ 𝐴 = +∞))
8 renepnf 11310 . . . . 5 (𝐴 ∈ ℝ → 𝐴 ≠ +∞)
9 mnfnepnf 11318 . . . . . 6 -∞ ≠ +∞
10 neeq1 3002 . . . . . 6 (𝐴 = -∞ → (𝐴 ≠ +∞ ↔ -∞ ≠ +∞))
119, 10mpbiri 258 . . . . 5 (𝐴 = -∞ → 𝐴 ≠ +∞)
128, 11jaoi 857 . . . 4 ((𝐴 ∈ ℝ ∨ 𝐴 = -∞) → 𝐴 ≠ +∞)
1312neneqd 2944 . . 3 ((𝐴 ∈ ℝ ∨ 𝐴 = -∞) → ¬ 𝐴 = +∞)
1413pm4.71i 559 . 2 ((𝐴 ∈ ℝ ∨ 𝐴 = -∞) ↔ ((𝐴 ∈ ℝ ∨ 𝐴 = -∞) ∧ ¬ 𝐴 = +∞))
151, 7, 143bitr4i 303 1 ((𝐴 ∈ ℝ*𝐴 ≠ +∞) ↔ (𝐴 ∈ ℝ ∨ 𝐴 = -∞))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wb 206  wa 395  wo 847  w3o 1085   = wceq 1539  wcel 2107  wne 2939  cr 11155  +∞cpnf 11293  -∞cmnf 11294  *cxr 11295
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-ext 2707  ax-sep 5295  ax-pow 5364  ax-pr 5431  ax-un 7756  ax-cnex 11212  ax-resscn 11213
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1542  df-ex 1779  df-sb 2064  df-clab 2714  df-cleq 2728  df-clel 2815  df-ne 2940  df-nel 3046  df-rab 3436  df-v 3481  df-un 3955  df-in 3957  df-ss 3967  df-pw 4601  df-sn 4626  df-pr 4628  df-uni 4907  df-pnf 11298  df-mnf 11299  df-xr 11300
This theorem is referenced by:  xaddnepnf  13280  xlt2addrd  32763  xrlexaddrp  45368  xrnpnfmnf  45490
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