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Theorem xrltnr 9517
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 9514 . 2 (𝐴 ∈ ℝ* ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞))
2 ltnr 7805 . . 3 (𝐴 ∈ ℝ → ¬ 𝐴 < 𝐴)
3 pnfnre 7771 . . . . . . . . . 10 +∞ ∉ ℝ
43neli 2380 . . . . . . . . 9 ¬ +∞ ∈ ℝ
54intnan 897 . . . . . . . 8 ¬ (+∞ ∈ ℝ ∧ +∞ ∈ ℝ)
65intnanr 898 . . . . . . 7 ¬ ((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞)
7 pnfnemnf 7784 . . . . . . . . 9 +∞ ≠ -∞
87neii 2285 . . . . . . . 8 ¬ +∞ = -∞
98intnanr 898 . . . . . . 7 ¬ (+∞ = -∞ ∧ +∞ = +∞)
106, 9pm3.2ni 785 . . . . . 6 ¬ (((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞))
114intnanr 898 . . . . . . 7 ¬ (+∞ ∈ ℝ ∧ +∞ = +∞)
124intnan 897 . . . . . . 7 ¬ (+∞ = -∞ ∧ +∞ ∈ ℝ)
1311, 12pm3.2ni 785 . . . . . 6 ¬ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ))
1410, 13pm3.2ni 785 . . . . 5 ¬ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ)))
15 pnfxr 7782 . . . . . 6 +∞ ∈ ℝ*
16 ltxr 9513 . . . . . 6 ((+∞ ∈ ℝ* ∧ +∞ ∈ ℝ*) → (+∞ < +∞ ↔ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ)))))
1715, 15, 16mp2an 420 . . . . 5 (+∞ < +∞ ↔ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ < +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ))))
1814, 17mtbir 643 . . . 4 ¬ +∞ < +∞
19 breq12 3902 . . . . 5 ((𝐴 = +∞ ∧ 𝐴 = +∞) → (𝐴 < 𝐴 ↔ +∞ < +∞))
2019anidms 392 . . . 4 (𝐴 = +∞ → (𝐴 < 𝐴 ↔ +∞ < +∞))
2118, 20mtbiri 647 . . 3 (𝐴 = +∞ → ¬ 𝐴 < 𝐴)
22 mnfnre 7772 . . . . . . . . . 10 -∞ ∉ ℝ
2322neli 2380 . . . . . . . . 9 ¬ -∞ ∈ ℝ
2423intnan 897 . . . . . . . 8 ¬ (-∞ ∈ ℝ ∧ -∞ ∈ ℝ)
2524intnanr 898 . . . . . . 7 ¬ ((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞)
267nesymi 2329 . . . . . . . 8 ¬ -∞ = +∞
2726intnan 897 . . . . . . 7 ¬ (-∞ = -∞ ∧ -∞ = +∞)
2825, 27pm3.2ni 785 . . . . . 6 ¬ (((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞))
2923intnanr 898 . . . . . . 7 ¬ (-∞ ∈ ℝ ∧ -∞ = +∞)
3023intnan 897 . . . . . . 7 ¬ (-∞ = -∞ ∧ -∞ ∈ ℝ)
3129, 30pm3.2ni 785 . . . . . 6 ¬ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ))
3228, 31pm3.2ni 785 . . . . 5 ¬ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ)))
33 mnfxr 7786 . . . . . 6 -∞ ∈ ℝ*
34 ltxr 9513 . . . . . 6 ((-∞ ∈ ℝ* ∧ -∞ ∈ ℝ*) → (-∞ < -∞ ↔ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ)))))
3533, 33, 34mp2an 420 . . . . 5 (-∞ < -∞ ↔ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ < -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ))))
3632, 35mtbir 643 . . . 4 ¬ -∞ < -∞
37 breq12 3902 . . . . 5 ((𝐴 = -∞ ∧ 𝐴 = -∞) → (𝐴 < 𝐴 ↔ -∞ < -∞))
3837anidms 392 . . . 4 (𝐴 = -∞ → (𝐴 < 𝐴 ↔ -∞ < -∞))
3936, 38mtbiri 647 . . 3 (𝐴 = -∞ → ¬ 𝐴 < 𝐴)
402, 21, 393jaoi 1264 . 2 ((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) → ¬ 𝐴 < 𝐴)
411, 40sylbi 120 1 (𝐴 ∈ ℝ* → ¬ 𝐴 < 𝐴)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 103  wb 104  wo 680  w3o 944   = wceq 1314  wcel 1463   class class class wbr 3897  cr 7583   < cltrr 7588  +∞cpnf 7761  -∞cmnf 7762  *cxr 7763   < clt 7764
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 586  ax-in2 587  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-13 1474  ax-14 1475  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097  ax-sep 4014  ax-pow 4066  ax-pr 4099  ax-un 4323  ax-setind 4420  ax-cnex 7675  ax-resscn 7676  ax-pre-ltirr 7696
This theorem depends on definitions:  df-bi 116  df-3or 946  df-3an 947  df-tru 1317  df-fal 1320  df-nf 1420  df-sb 1719  df-eu 1978  df-mo 1979  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2245  df-ne 2284  df-nel 2379  df-ral 2396  df-rex 2397  df-rab 2400  df-v 2660  df-dif 3041  df-un 3043  df-in 3045  df-ss 3052  df-pw 3480  df-sn 3501  df-pr 3502  df-op 3504  df-uni 3705  df-br 3898  df-opab 3958  df-xp 4513  df-pnf 7766  df-mnf 7767  df-xr 7768  df-ltxr 7769
This theorem is referenced by:  xrltnsym  9530  xrltso  9533  xrlttri3  9534  xrleid  9537  xrltne  9547  nltpnft  9548  ngtmnft  9551  xrrebnd  9553  xposdif  9616  lbioog  9647  ubioog  9648  xrmaxleim  10964  xrmaxiflemlub  10968
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