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Theorem ltne 8037
Description: 'Less than' implies not equal. See also ltap 8585 which is the same but for apartness. (Contributed by NM, 9-Oct-1999.) (Revised by Mario Carneiro, 16-Sep-2015.)
Assertion
Ref Expression
ltne ((𝐴 ∈ ℝ ∧ 𝐴 < 𝐵) → 𝐵𝐴)

Proof of Theorem ltne
StepHypRef Expression
1 ltnr 8029 . . . 4 (𝐴 ∈ ℝ → ¬ 𝐴 < 𝐴)
2 breq2 4006 . . . . 5 (𝐵 = 𝐴 → (𝐴 < 𝐵𝐴 < 𝐴))
32notbid 667 . . . 4 (𝐵 = 𝐴 → (¬ 𝐴 < 𝐵 ↔ ¬ 𝐴 < 𝐴))
41, 3syl5ibrcom 157 . . 3 (𝐴 ∈ ℝ → (𝐵 = 𝐴 → ¬ 𝐴 < 𝐵))
54necon2ad 2404 . 2 (𝐴 ∈ ℝ → (𝐴 < 𝐵𝐵𝐴))
65imp 124 1 ((𝐴 ∈ ℝ ∧ 𝐴 < 𝐵) → 𝐵𝐴)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 104   = wceq 1353  wcel 2148  wne 2347   class class class wbr 4002  cr 7806   < clt 7987
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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4120  ax-pow 4173  ax-pr 4208  ax-un 4432  ax-setind 4535  ax-cnex 7898  ax-resscn 7899  ax-pre-ltirr 7919
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-nel 2443  df-ral 2460  df-rex 2461  df-rab 2464  df-v 2739  df-dif 3131  df-un 3133  df-in 3135  df-ss 3142  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-br 4003  df-opab 4064  df-xp 4631  df-pnf 7989  df-mnf 7990  df-ltxr 7992
This theorem is referenced by:  gtneii  8048  ltnei  8056  gtned  8065  gt0ne0  8379  lt0ne0  8380  gt0ne0d  8464  nngt1ne1  8949  zdceq  9323  qdceq  10241  coprm  12135  phibndlem  12207  tridceq  14655
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