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Theorem xrltnr 8701
 Description: The extended real 'less than' is irreflexive. (Contributed by NM, 14-Oct-2005.)
Assertion
Ref Expression
xrltnr (𝐴 ∈ ℝ* → ¬ 𝐴 < 𝐴)

Proof of Theorem xrltnr
StepHypRef Expression
1 elxr 8696 . 2 (𝐴 ∈ ℝ* ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞))
2 ltnr 7095 . . 3 (𝐴 ∈ ℝ → ¬ 𝐴 < 𝐴)
3 pnfnre 7067 . . . . . . . . . 10 +∞ ∉ ℝ
43neli 2299 . . . . . . . . 9 ¬ +∞ ∈ ℝ
54intnan 838 . . . . . . . 8 ¬ (+∞ ∈ ℝ ∧ +∞ ∈ ℝ)
65intnanr 839 . . . . . . 7 ¬ ((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞)
7 pnfnemnf 8697 . . . . . . . . 9 +∞ ≠ -∞
87neii 2208 . . . . . . . 8 ¬ +∞ = -∞
98intnanr 839 . . . . . . 7 ¬ (+∞ = -∞ ∧ +∞ = +∞)
106, 9pm3.2ni 726 . . . . . 6 ¬ (((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞))
114intnanr 839 . . . . . . 7 ¬ (+∞ ∈ ℝ ∧ +∞ = +∞)
124intnan 838 . . . . . . 7 ¬ (+∞ = -∞ ∧ +∞ ∈ ℝ)
1311, 12pm3.2ni 726 . . . . . 6 ¬ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ))
1410, 13pm3.2ni 726 . . . . 5 ¬ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ)))
15 pnfxr 8692 . . . . . 6 +∞ ∈ ℝ*
16 ltxr 8695 . . . . . 6 ((+∞ ∈ ℝ* ∧ +∞ ∈ ℝ*) → (+∞ < +∞ ↔ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ)))))
1715, 15, 16mp2an 402 . . . . 5 (+∞ < +∞ ↔ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ))))
1814, 17mtbir 596 . . . 4 ¬ +∞ < +∞
19 breq12 3769 . . . . 5 ((𝐴 = +∞ ∧ 𝐴 = +∞) → (𝐴 < 𝐴 ↔ +∞ < +∞))
2019anidms 377 . . . 4 (𝐴 = +∞ → (𝐴 < 𝐴 ↔ +∞ < +∞))
2118, 20mtbiri 600 . . 3 (𝐴 = +∞ → ¬ 𝐴 < 𝐴)
22 mnfnre 7068 . . . . . . . . . 10 -∞ ∉ ℝ
2322neli 2299 . . . . . . . . 9 ¬ -∞ ∈ ℝ
2423intnan 838 . . . . . . . 8 ¬ (-∞ ∈ ℝ ∧ -∞ ∈ ℝ)
2524intnanr 839 . . . . . . 7 ¬ ((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞)
267nesymi 2251 . . . . . . . 8 ¬ -∞ = +∞
2726intnan 838 . . . . . . 7 ¬ (-∞ = -∞ ∧ -∞ = +∞)
2825, 27pm3.2ni 726 . . . . . 6 ¬ (((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞))
2923intnanr 839 . . . . . . 7 ¬ (-∞ ∈ ℝ ∧ -∞ = +∞)
3023intnan 838 . . . . . . 7 ¬ (-∞ = -∞ ∧ -∞ ∈ ℝ)
3129, 30pm3.2ni 726 . . . . . 6 ¬ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ))
3228, 31pm3.2ni 726 . . . . 5 ¬ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ)))
33 mnfxr 8694 . . . . . 6 -∞ ∈ ℝ*
34 ltxr 8695 . . . . . 6 ((-∞ ∈ ℝ* ∧ -∞ ∈ ℝ*) → (-∞ < -∞ ↔ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ)))))
3533, 33, 34mp2an 402 . . . . 5 (-∞ < -∞ ↔ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ))))
3632, 35mtbir 596 . . . 4 ¬ -∞ < -∞
37 breq12 3769 . . . . 5 ((𝐴 = -∞ ∧ 𝐴 = -∞) → (𝐴 < 𝐴 ↔ -∞ < -∞))
3837anidms 377 . . . 4 (𝐴 = -∞ → (𝐴 < 𝐴 ↔ -∞ < -∞))
3936, 38mtbiri 600 . . 3 (𝐴 = -∞ → ¬ 𝐴 < 𝐴)
402, 21, 393jaoi 1198 . 2 ((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) → ¬ 𝐴 < 𝐴)
411, 40sylbi 114 1 (𝐴 ∈ ℝ* → ¬ 𝐴 < 𝐴)
 Colors of variables: wff set class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 97   ↔ wb 98   ∨ wo 629   ∨ w3o 884   = wceq 1243   ∈ wcel 1393   class class class wbr 3764  ℝcr 6888   <ℝ cltrr 6893  +∞cpnf 7057  -∞cmnf 7058  ℝ*cxr 7059   < clt 7060 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-13 1404  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944  ax-un 4170  ax-setind 4262  ax-cnex 6975  ax-resscn 6976  ax-pre-ltirr 6996 This theorem depends on definitions:  df-bi 110  df-3or 886  df-3an 887  df-tru 1246  df-fal 1249  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ne 2206  df-nel 2207  df-ral 2311  df-rex 2312  df-rab 2315  df-v 2559  df-dif 2920  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-uni 3581  df-br 3765  df-opab 3819  df-xp 4351  df-pnf 7062  df-mnf 7063  df-xr 7064  df-ltxr 7065 This theorem is referenced by:  xrltnsym  8714  xrltso  8717  xrlttri3  8718  xrleid  8720  xrltne  8729  nltpnft  8730  ngtmnft  8731  xrrebnd  8732  lbioog  8782  ubioog  8783
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