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Theorem tlt2 29664
Description: In a Toset, two elements must compare. (Contributed by Thierry Arnoux, 13-Apr-2018.)
Hypotheses
Ref Expression
tlt2.b 𝐵 = (Base‘𝐾)
tlt2.e = (le‘𝐾)
tlt2.l < = (lt‘𝐾)
Assertion
Ref Expression
tlt2 ((𝐾 ∈ Toset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌𝑌 < 𝑋))

Proof of Theorem tlt2
StepHypRef Expression
1 exmidd 432 . 2 ((𝐾 ∈ Toset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌 ∨ ¬ 𝑋 𝑌))
2 tlt2.b . . . . 5 𝐵 = (Base‘𝐾)
3 tlt2.e . . . . 5 = (le‘𝐾)
4 tlt2.l . . . . 5 < = (lt‘𝐾)
52, 3, 4tltnle 29662 . . . 4 ((𝐾 ∈ Toset ∧ 𝑌𝐵𝑋𝐵) → (𝑌 < 𝑋 ↔ ¬ 𝑋 𝑌))
653com23 1271 . . 3 ((𝐾 ∈ Toset ∧ 𝑋𝐵𝑌𝐵) → (𝑌 < 𝑋 ↔ ¬ 𝑋 𝑌))
76orbi2d 738 . 2 ((𝐾 ∈ Toset ∧ 𝑋𝐵𝑌𝐵) → ((𝑋 𝑌𝑌 < 𝑋) ↔ (𝑋 𝑌 ∨ ¬ 𝑋 𝑌)))
81, 7mpbird 247 1 ((𝐾 ∈ Toset ∧ 𝑋𝐵𝑌𝐵) → (𝑋 𝑌𝑌 < 𝑋))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 383  w3a 1037   = wceq 1483  wcel 1990   class class class wbr 4653  cfv 5888  Basecbs 15857  lecple 15948  ltcplt 16941  Tosetctos 17033
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-iota 5851  df-fun 5890  df-fv 5896  df-preset 16928  df-poset 16946  df-plt 16958  df-toset 17034
This theorem is referenced by:  tlt3  29665  archirngz  29743  archiabllem2a  29748
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