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Theorem xrltnr 10057
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 10054 . 2 (𝐴 ∈ ℝ* ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞))
2 ltnr 8299 . . 3 (𝐴 ∈ ℝ → ¬ 𝐴 < 𝐴)
3 pnfnre 8264 . . . . . . . . . 10 +∞ ∉ ℝ
43neli 2500 . . . . . . . . 9 ¬ +∞ ∈ ℝ
54intnan 937 . . . . . . . 8 ¬ (+∞ ∈ ℝ ∧ +∞ ∈ ℝ)
65intnanr 938 . . . . . . 7 ¬ ((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞)
7 pnfnemnf 8277 . . . . . . . . 9 +∞ ≠ -∞
87neii 2405 . . . . . . . 8 ¬ +∞ = -∞
98intnanr 938 . . . . . . 7 ¬ (+∞ = -∞ ∧ +∞ = +∞)
106, 9pm3.2ni 821 . . . . . 6 ¬ (((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞))
114intnanr 938 . . . . . . 7 ¬ (+∞ ∈ ℝ ∧ +∞ = +∞)
124intnan 937 . . . . . . 7 ¬ (+∞ = -∞ ∧ +∞ ∈ ℝ)
1311, 12pm3.2ni 821 . . . . . 6 ¬ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ))
1410, 13pm3.2ni 821 . . . . 5 ¬ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ)))
15 pnfxr 8275 . . . . . 6 +∞ ∈ ℝ*
16 ltxr 10053 . . . . . 6 ((+∞ ∈ ℝ* ∧ +∞ ∈ ℝ*) → (+∞ < +∞ ↔ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ)))))
1715, 15, 16mp2an 426 . . . . 5 (+∞ < +∞ ↔ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ))))
1814, 17mtbir 678 . . . 4 ¬ +∞ < +∞
19 breq12 4098 . . . . 5 ((𝐴 = +∞ ∧ 𝐴 = +∞) → (𝐴 < 𝐴 ↔ +∞ < +∞))
2019anidms 397 . . . 4 (𝐴 = +∞ → (𝐴 < 𝐴 ↔ +∞ < +∞))
2118, 20mtbiri 682 . . 3 (𝐴 = +∞ → ¬ 𝐴 < 𝐴)
22 mnfnre 8265 . . . . . . . . . 10 -∞ ∉ ℝ
2322neli 2500 . . . . . . . . 9 ¬ -∞ ∈ ℝ
2423intnan 937 . . . . . . . 8 ¬ (-∞ ∈ ℝ ∧ -∞ ∈ ℝ)
2524intnanr 938 . . . . . . 7 ¬ ((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞)
267nesymi 2449 . . . . . . . 8 ¬ -∞ = +∞
2726intnan 937 . . . . . . 7 ¬ (-∞ = -∞ ∧ -∞ = +∞)
2825, 27pm3.2ni 821 . . . . . 6 ¬ (((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞))
2923intnanr 938 . . . . . . 7 ¬ (-∞ ∈ ℝ ∧ -∞ = +∞)
3023intnan 937 . . . . . . 7 ¬ (-∞ = -∞ ∧ -∞ ∈ ℝ)
3129, 30pm3.2ni 821 . . . . . 6 ¬ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ))
3228, 31pm3.2ni 821 . . . . 5 ¬ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ)))
33 mnfxr 8279 . . . . . 6 -∞ ∈ ℝ*
34 ltxr 10053 . . . . . 6 ((-∞ ∈ ℝ* ∧ -∞ ∈ ℝ*) → (-∞ < -∞ ↔ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ)))))
3533, 33, 34mp2an 426 . . . . 5 (-∞ < -∞ ↔ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ))))
3632, 35mtbir 678 . . . 4 ¬ -∞ < -∞
37 breq12 4098 . . . . 5 ((𝐴 = -∞ ∧ 𝐴 = -∞) → (𝐴 < 𝐴 ↔ -∞ < -∞))
3837anidms 397 . . . 4 (𝐴 = -∞ → (𝐴 < 𝐴 ↔ -∞ < -∞))
3936, 38mtbiri 682 . . 3 (𝐴 = -∞ → ¬ 𝐴 < 𝐴)
402, 21, 393jaoi 1340 . 2 ((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) → ¬ 𝐴 < 𝐴)
411, 40sylbi 121 1 (𝐴 ∈ ℝ* → ¬ 𝐴 < 𝐴)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 104  wb 105  wo 716  w3o 1004   = wceq 1398  wcel 2202   class class class wbr 4093  cr 8074   < cltrr 8079  +∞cpnf 8254  -∞cmnf 8255  *cxr 8256   < clt 8257
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-un 4536  ax-setind 4641  ax-cnex 8166  ax-resscn 8167  ax-pre-ltirr 8187
This theorem depends on definitions:  df-bi 117  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-nel 2499  df-ral 2516  df-rex 2517  df-rab 2520  df-v 2805  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-opab 4156  df-xp 4737  df-pnf 8259  df-mnf 8260  df-xr 8261  df-ltxr 8262
This theorem is referenced by:  xrltnsym  10071  xrltso  10074  xrlttri3  10075  xrleid  10078  xrltne  10091  nltpnft  10092  ngtmnft  10095  xrrebnd  10097  xposdif  10160  lbioog  10191  ubioog  10192  xrmaxleim  11865  xrmaxiflemlub  11869
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