Users' Mathboxes Mathbox for Norm Megill < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  3at Structured version   Visualization version   GIF version
Theorem 3at 38958
Description: Any three non-colinear atoms in a (lattice) plane determine the plane uniquely. This is the 2-dimensional analogue of ps-1 38945 for lines and 4at 39081 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 38957 . . 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 1119 . 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 38830 . . . . 5 (𝐾 ∈ HL β†’ 𝐾 ∈ Lat)
7 simpl 482 . . . . . . . 8 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝐾 ∈ Lat)
8 simpr1 1192 . . . . . . . . . 10 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑃 ∈ 𝐴)
9 eqid 2728 . . . . . . . . . . 11 (Baseβ€˜πΎ) = (Baseβ€˜πΎ)
109, 3atbase 38756 . . . . . . . . . 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 1193 . . . . . . . . . 10 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑄 ∈ 𝐴)
139, 3atbase 38756 . . . . . . . . . 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 18425 . . . . . . . . 9 ((𝐾 ∈ Lat ∧ 𝑃 ∈ (Baseβ€˜πΎ) ∧ 𝑄 ∈ (Baseβ€˜πΎ)) β†’ (𝑃 ∨ 𝑄) ∈ (Baseβ€˜πΎ))
167, 11, 14, 15syl3anc 1369 . . . . . . . 8 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ (𝑃 ∨ 𝑄) ∈ (Baseβ€˜πΎ))
17 simpr3 1194 . . . . . . . . 9 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ 𝑅 ∈ 𝐴)
189, 3atbase 38756 . . . . . . . . 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 18425 . . . . . . . 8 ((𝐾 ∈ Lat ∧ (𝑃 ∨ 𝑄) ∈ (Baseβ€˜πΎ) ∧ 𝑅 ∈ (Baseβ€˜πΎ)) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ∈ (Baseβ€˜πΎ))
217, 16, 19, 20syl3anc 1369 . . . . . . 7 ((𝐾 ∈ Lat ∧ (𝑃 ∈ 𝐴 ∧ 𝑄 ∈ 𝐴 ∧ 𝑅 ∈ 𝐴)) β†’ ((𝑃 ∨ 𝑄) ∨ 𝑅) ∈ (Baseβ€˜πΎ))
229, 1latref 18427 . . . . . . 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 5147 . . . . . 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 1130 . . 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 1085   = wceq 1534   ∈ wcel 2099   β‰  wne 2936   class class class wbr 5143  β€˜cfv 6543  (class class class)co 7415  Basecbs 17174  lecple 17234  joincjn 18297  Latclat 18417  Atomscatm 38730  HLchlt 38817
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2699  ax-rep 5280  ax-sep 5294  ax-nul 5301  ax-pow 5360  ax-pr 5424  ax-un 7735
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-3an 1087  df-tru 1537  df-fal 1547  df-ex 1775  df-nf 1779  df-sb 2061  df-mo 2530  df-eu 2559  df-clab 2706  df-cleq 2720  df-clel 2806  df-nfc 2881  df-ne 2937  df-ral 3058  df-rex 3067  df-rmo 3372  df-reu 3373  df-rab 3429  df-v 3472  df-sbc 3776  df-csb 3891  df-dif 3948  df-un 3950  df-in 3952  df-ss 3962  df-nul 4320  df-if 4526  df-pw 4601  df-sn 4626  df-pr 4628  df-op 4632  df-uni 4905  df-iun 4994  df-br 5144  df-opab 5206  df-mpt 5227  df-id 5571  df-xp 5679  df-rel 5680  df-cnv 5681  df-co 5682  df-dm 5683  df-rn 5684  df-res 5685  df-ima 5686  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-f1 6548  df-fo 6549  df-f1o 6550  df-fv 6551  df-riota 7371  df-ov 7418  df-oprab 7419  df-proset 18281  df-poset 18299  df-plt 18316  df-lub 18332  df-glb 18333  df-join 18334  df-meet 18335  df-p0 18411  df-lat 18418  df-covers 38733  df-ats 38734  df-atl 38765  df-cvlat 38789  df-hlat 38818
This theorem is referenced by:  llncvrlpln2  39025  2lplnja  39087
  Copyright terms: Public domain W3C validator