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Theorem xrlenlt 7082
Description: 'Less than or equal to' expressed in terms of 'less than', for extended reals. (Contributed by NM, 14-Oct-2005.)
Assertion
Ref Expression
xrlenlt ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐴𝐵 ↔ ¬ 𝐵 < 𝐴))

Proof of Theorem xrlenlt
StepHypRef Expression
1 df-br 3765 . . 3 (𝐴𝐵 ↔ ⟨𝐴, 𝐵⟩ ∈ ≤ )
2 opelxpi 4376 . . . 4 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → ⟨𝐴, 𝐵⟩ ∈ (ℝ* × ℝ*))
3 df-le 7064 . . . . . . 7 ≤ = ((ℝ* × ℝ*) ∖ < )
43eleq2i 2104 . . . . . 6 (⟨𝐴, 𝐵⟩ ∈ ≤ ↔ ⟨𝐴, 𝐵⟩ ∈ ((ℝ* × ℝ*) ∖ < ))
5 eldif 2927 . . . . . 6 (⟨𝐴, 𝐵⟩ ∈ ((ℝ* × ℝ*) ∖ < ) ↔ (⟨𝐴, 𝐵⟩ ∈ (ℝ* × ℝ*) ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ < ))
64, 5bitri 173 . . . . 5 (⟨𝐴, 𝐵⟩ ∈ ≤ ↔ (⟨𝐴, 𝐵⟩ ∈ (ℝ* × ℝ*) ∧ ¬ ⟨𝐴, 𝐵⟩ ∈ < ))
76baib 828 . . . 4 (⟨𝐴, 𝐵⟩ ∈ (ℝ* × ℝ*) → (⟨𝐴, 𝐵⟩ ∈ ≤ ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ < ))
82, 7syl 14 . . 3 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (⟨𝐴, 𝐵⟩ ∈ ≤ ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ < ))
91, 8syl5bb 181 . 2 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐴𝐵 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ < ))
10 opelcnvg 4515 . . . 4 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (⟨𝐴, 𝐵⟩ ∈ < ↔ ⟨𝐵, 𝐴⟩ ∈ < ))
11 df-br 3765 . . . 4 (𝐵 < 𝐴 ↔ ⟨𝐵, 𝐴⟩ ∈ < )
1210, 11syl6rbbr 188 . . 3 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐵 < 𝐴 ↔ ⟨𝐴, 𝐵⟩ ∈ < ))
1312notbid 592 . 2 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (¬ 𝐵 < 𝐴 ↔ ¬ ⟨𝐴, 𝐵⟩ ∈ < ))
149, 13bitr4d 180 1 ((𝐴 ∈ ℝ*𝐵 ∈ ℝ*) → (𝐴𝐵 ↔ ¬ 𝐵 < 𝐴))
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 97  wb 98  wcel 1393  cdif 2914  cop 3378   class class class wbr 3764   × cxp 4343  ccnv 4344  *cxr 7057   < clt 7058  cle 7059
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-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
This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  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-ral 2311  df-rex 2312  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-br 3765  df-opab 3819  df-xp 4351  df-cnv 4353  df-le 7064
This theorem is referenced by:  lenlt  7092  pnfge  8708  mnfle  8711  xrltle  8717  xrleid  8718  xrletri3  8719  xrlelttr  8720  xrltletr  8721  xrletr  8722  xleneg  8748  iccid  8792  icc0r  8793  icodisj  8858  ioodisj  8859
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