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Theorem s3eqd 14995
Description: Equality theorem for a length 3 word. (Contributed by Mario Carneiro, 27-Feb-2016.)
Hypotheses
Ref Expression
s2eqd.1 (𝜑 → 𝐴 = 𝑁)
s2eqd.2 (𝜑 → 𝐵 = 𝑂)
s3eqd.3 (𝜑 → 𝐶 = 𝑃)
Assertion
Ref Expression
s3eqd (𝜑 → ⟨“𝐴𝐵𝐶”⟩ = ⟨“𝑁𝑂𝑃”⟩)

Proof of Theorem s3eqd
StepHypRef Expression
1 s2eqd.1 . . . 4 (𝜑 → 𝐴 = 𝑁)
2 s2eqd.2 . . . 4 (𝜑 → 𝐵 = 𝑂)
31, 2s2eqd 14994 . . 3 (𝜑 → ⟨“𝐴𝐵”⟩ = ⟨“𝑁𝑂”⟩)
4 s3eqd.3 . . . 4 (𝜑 → 𝐶 = 𝑃)
54s1eqd 14728 . . 3 (𝜑 → ⟨“𝐶”⟩ = ⟨“𝑃”⟩)
63, 5oveq12d 7430 . 2 (𝜑 → (⟨“𝐴𝐵”⟩ ++ ⟨“𝐶”⟩) = (⟨“𝑁𝑂”⟩ ++ ⟨“𝑃”⟩))
7 df-s3 14980 . 2 ⟨“𝐴𝐵𝐶”⟩ = (⟨“𝐴𝐵”⟩ ++ ⟨“𝐶”⟩)
8 df-s3 14980 . 2 ⟨“𝑁𝑂𝑃”⟩ = (⟨“𝑁𝑂”⟩ ++ ⟨“𝑃”⟩)
96, 7, 83eqtr4g 2821 1 (𝜑 → ⟨“𝐴𝐵𝐶”⟩ = ⟨“𝑁𝑂𝑃”⟩)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570  (class class class)co 7412   ++ cconcat 14695  ⟨“cs1 14722  ⟨“cs2 14972  ⟨“cs3 14973
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2740  df-cleq 2753  df-clel 2836  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-iota 6487  df-fv 6539  df-ov 7415  df-s1 14723  df-s2 14979  df-s3 14980
This theorem is used by:  s4eqd  14996  s3eq2  15001  s3rex  15081  s3sndisj  15100  s3iunsndisj  15101  ragcgr  29164  perpneq  29171  isperp2  29172  isperp2d  29173  footexALT  29175  footexlem2  29177  foot  29179  perprag  29184  perpdragALT  29185  colperpexlem1  29188  lmiisolem  29283  hypcgrlem1  29287  hypcgrlem2  29288  trgcopyeu  29295  iscgra  29298  iscgra1  29299  iscgrad  29300  sacgr  29321  isleag  29348  isleagd  29349  elcgrabasi  29357  angmgmaddov1  29370  angmgmaddov2  29371  angmgmaddcl  29373  angmgmval  29376  iseqlg  29394  prlngmid2  29421
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