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Theorem 3at 38855
Description: Any three non-colinear atoms in a (lattice) plane determine the plane uniquely. This is the 2-dimensional analogue of ps-1 38842 for lines and 4at 38978 for volumes. I could not find this proof in the literature on projective geometry (where it is either given as an axiom or stated as an unproved fact), but it is similar to Theorem 15 of Veblen, "The Foundations of Geometry" (1911), p. 18, which uses different axioms. This proof was written before I became aware of Veblen's, and it is possible that a shorter proof could be obtained by using Veblen's proof for hints. (Contributed by NM, 23-Jun-2012.)
Hypotheses
Ref Expression
3at.l ≀ = (leβ€˜πΎ)
3at.j ∨ = (joinβ€˜πΎ)
3at.a 𝐴 = (Atomsβ€˜πΎ)
Assertion
Ref Expression
3at (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) ∧ (𝑆 ∈ 𝐴 ∧ 𝑇 ∈ 𝐴 ∧ π‘ˆ ∈ 𝐴)) ∧ (Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄) ∧ 𝑃 β‰  𝑄)) β†’ (((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ) ↔ ((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ)))
Proof of Theorem 3at
StepHypRef Expression
1 3at.l . . . 4 ≀ = (leβ€˜πΎ)
2 3at.j . . . 4 ∨ = (joinβ€˜πΎ)
3 3at.a . . . 4 𝐴 = (Atomsβ€˜πΎ)
41, 2, 33atlem7 38854 . . 3 (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) ∧ (𝑆 ∈ 𝐴 ∧ 𝑇 ∈ 𝐴 ∧ π‘ˆ ∈ 𝐴)) ∧ (Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄) ∧ 𝑃 β‰  𝑄) ∧ ((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ)) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ))
543expia 1118 . 2 (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) ∧ (𝑆 ∈ 𝐴 ∧ 𝑇 ∈ 𝐴 ∧ π‘ˆ ∈ 𝐴)) ∧ (Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄) ∧ 𝑃 β‰  𝑄)) β†’ (((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ)))
6 hllat 38727 . . . . 5 (𝐾 ∈ HL β†’ 𝐾 ∈ Lat)
7 simpl 482 . . . . . . . 8 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝐾 ∈ Lat)
8 simpr1 1191 . . . . . . . . . 10 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑃 ∈ 𝐴)
9 eqid 2724 . . . . . . . . . . 11 (Baseβ€˜πΎ) = (Baseβ€˜πΎ)
109, 3atbase 38653 . . . . . . . . . 10 (𝑃 ∈ 𝐴 β†’ 𝑃 ∈ (Baseβ€˜πΎ))
118, 10syl 17 . . . . . . . . 9 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑃 ∈ (Baseβ€˜πΎ))
12 simpr2 1192 . . . . . . . . . 10 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑄 ∈ 𝐴)
139, 3atbase 38653 . . . . . . . . . 10 (𝑄 ∈ 𝐴 β†’ 𝑄 ∈ (Baseβ€˜πΎ))
1412, 13syl 17 . . . . . . . . 9 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑄 ∈ (Baseβ€˜πΎ))
159, 2latjcl 18396 . . . . . . . . 9 ((𝐾 ∈ Lat ∧ 𝑃 ∈ (Baseβ€˜πΎ) ∧ 𝑄 ∈ (Baseβ€˜πΎ)) β†’ (𝑃 ∨ 𝑄) ∈ (Baseβ€˜πΎ))
167, 11, 14, 15syl3anc 1368 . . . . . . . 8 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ (𝑃 ∨ 𝑄) ∈ (Baseβ€˜πΎ))
17 simpr3 1193 . . . . . . . . 9 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑅 ∈ 𝐴)
189, 3atbase 38653 . . . . . . . . 9 (𝑅 ∈ 𝐴 β†’ 𝑅 ∈ (Baseβ€˜πΎ))
1917, 18syl 17 . . . . . . . 8 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑅 ∈ (Baseβ€˜πΎ))
209, 2latjcl 18396 . . . . . . . 8 ((𝐾 ∈ Lat ∧ (𝑃 ∨ 𝑄) ∈ (Baseβ€˜πΎ) ∧ 𝑅 ∈ (Baseβ€˜πΎ)) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ∈ (Baseβ€˜πΎ))
217, 16, 19, 20syl3anc 1368 . . . . . . 7 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ∈ (Baseβ€˜πΎ))
229, 1latref 18398 . . . . . . 7 ((𝐾 ∈ Lat ∧ ((𝑃 ∨ 𝑄) ∨ 𝑅) ∈ (Baseβ€˜πΎ)) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑃 ∨ 𝑄) ∨ 𝑅))
2321, 22syldan 590 . . . . . 6 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑃 ∨ 𝑄) ∨ 𝑅))
24 breq2 5143 . . . . . 6 (((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ) β†’ (((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑃 ∨ 𝑄) ∨ 𝑅) ↔ ((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ)))
2523, 24syl5ibcom 244 . . . . 5 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ (((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ)))
266, 25sylan 579 . . . 4 ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ (((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ)))
27263adant3 1129 . . 3 ((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) ∧ (𝑆 ∈ 𝐴 ∧ 𝑇 ∈ 𝐴 ∧ π‘ˆ ∈ 𝐴)) β†’ (((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ)))
2827adantr 480 . 2 (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) ∧ (𝑆 ∈ 𝐴 ∧ 𝑇 ∈ 𝐴 ∧ π‘ˆ ∈ 𝐴)) ∧ (Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄) ∧ 𝑃 β‰  𝑄)) β†’ (((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ)))
295, 28impbid 211 1 (((𝐾 ∈ HL ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴) ∧ (𝑆 ∈ 𝐴 ∧ 𝑇 ∈ 𝐴 ∧ π‘ˆ ∈ 𝐴)) ∧ (Β¬ 𝑅 ≀ (𝑃 ∨ 𝑄) ∧ 𝑃 β‰  𝑄)) β†’ (((𝑃 ∨ 𝑄) ∨ 𝑅) ≀ ((𝑆 ∨ 𝑇) ∨ π‘ˆ) ↔ ((𝑃 ∨ 𝑄) ∨ 𝑅) = ((𝑆 ∨ 𝑇) ∨ π‘ˆ)))
Colors of variables: wff setvar class
Syntax hints:  Β¬ wn 3   β†’ wi 4   ↔ wb 205   ∧ wa 395   ∧ w3a 1084   = wceq 1533   ∈ wcel 2098   β‰  wne 2932   class class class wbr 5139  β€˜cfv 6534  (class class class)co 7402  Basecbs 17145  lecple 17205  joincjn 18268  Latclat 18388  Atomscatm 38627  HLchlt 38714
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-10 2129  ax-11 2146  ax-12 2163  ax-ext 2695  ax-rep 5276  ax-sep 5290  ax-nul 5297  ax-pow 5354  ax-pr 5418  ax-un 7719
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-nf 1778  df-sb 2060  df-mo 2526  df-eu 2555  df-clab 2702  df-cleq 2716  df-clel 2802  df-nfc 2877  df-ne 2933  df-ral 3054  df-rex 3063  df-rmo 3368  df-reu 3369  df-rab 3425  df-v 3468  df-sbc 3771  df-csb 3887  df-dif 3944  df-un 3946  df-in 3948  df-ss 3958  df-nul 4316  df-if 4522  df-pw 4597  df-sn 4622  df-pr 4624  df-op 4628  df-uni 4901  df-iun 4990  df-br 5140  df-opab 5202  df-mpt 5223  df-id 5565  df-xp 5673  df-rel 5674  df-cnv 5675  df-co 5676  df-dm 5677  df-rn 5678  df-res 5679  df-ima 5680  df-iota 6486  df-fun 6536  df-fn 6537  df-f 6538  df-f1 6539  df-fo 6540  df-f1o 6541  df-fv 6542  df-riota 7358  df-ov 7405  df-oprab 7406  df-proset 18252  df-poset 18270  df-plt 18287  df-lub 18303  df-glb 18304  df-join 18305  df-meet 18306  df-p0 18382  df-lat 18389  df-covers 38630  df-ats 38631  df-atl 38662  df-cvlat 38686  df-hlat 38715
This theorem is referenced by:  llncvrlpln2  38922  2lplnja  38984
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