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Theorem ltne 8004
Description: 'Less than' implies not equal. See also ltap 8552 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 7996 . . . 4 (𝐴 ∈ ℝ → ¬ 𝐴 < 𝐴)
2 breq2 3993 . . . . 5 (𝐵 = 𝐴 → (𝐴 < 𝐵𝐴 < 𝐴))
32notbid 662 . . . 4 (𝐵 = 𝐴 → (¬ 𝐴 < 𝐵 ↔ ¬ 𝐴 < 𝐴))
41, 3syl5ibrcom 156 . . 3 (𝐴 ∈ ℝ → (𝐵 = 𝐴 → ¬ 𝐴 < 𝐵))
54necon2ad 2397 . 2 (𝐴 ∈ ℝ → (𝐴 < 𝐵𝐵𝐴))
65imp 123 1 ((𝐴 ∈ ℝ ∧ 𝐴 < 𝐵) → 𝐵𝐴)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wa 103   = wceq 1348  wcel 2141  wne 2340   class class class wbr 3989  cr 7773   < clt 7954
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 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-cnex 7865  ax-resscn 7866  ax-pre-ltirr 7886
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-rab 2457  df-v 2732  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-br 3990  df-opab 4051  df-xp 4617  df-pnf 7956  df-mnf 7957  df-ltxr 7959
This theorem is referenced by:  gtneii  8015  ltnei  8023  gtned  8032  gt0ne0  8346  lt0ne0  8347  gt0ne0d  8431  nngt1ne1  8913  zdceq  9287  qdceq  10203  coprm  12098  phibndlem  12170  tridceq  14088
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