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Theorem sgrp2nmndlem3 17619
 Description: Lemma 3 for sgrp2nmnd 17624. (Contributed by AV, 29-Jan-2020.)
Hypotheses
Ref Expression
mgm2nsgrp.s 𝑆 = {𝐴, 𝐵}
mgm2nsgrp.b (Base‘𝑀) = 𝑆
sgrp2nmnd.o (+g𝑀) = (𝑥𝑆, 𝑦𝑆 ↦ if(𝑥 = 𝐴, 𝐴, 𝐵))
sgrp2nmnd.p = (+g𝑀)
Assertion
Ref Expression
sgrp2nmndlem3 ((𝐶𝑆𝐵𝑆𝐴𝐵) → (𝐵 𝐶) = 𝐵)
Distinct variable groups:   𝑥,𝑆,𝑦   𝑥,𝐴,𝑦   𝑥,𝐵,𝑦   𝑥,𝑀   𝑥,𝐶,𝑦
Allowed substitution hints:   𝑀(𝑦)   (𝑥,𝑦)

Proof of Theorem sgrp2nmndlem3
StepHypRef Expression
1 sgrp2nmnd.p . . . 4 = (+g𝑀)
2 sgrp2nmnd.o . . . 4 (+g𝑀) = (𝑥𝑆, 𝑦𝑆 ↦ if(𝑥 = 𝐴, 𝐴, 𝐵))
31, 2eqtri 2792 . . 3 = (𝑥𝑆, 𝑦𝑆 ↦ if(𝑥 = 𝐴, 𝐴, 𝐵))
43a1i 11 . 2 ((𝐶𝑆𝐵𝑆𝐴𝐵) → = (𝑥𝑆, 𝑦𝑆 ↦ if(𝑥 = 𝐴, 𝐴, 𝐵)))
5 df-ne 2943 . . . . . 6 (𝐴𝐵 ↔ ¬ 𝐴 = 𝐵)
6 eqcom 2777 . . . . . . . . 9 (𝐴 = 𝑥𝑥 = 𝐴)
7 eqeq2 2781 . . . . . . . . . 10 (𝑥 = 𝐵 → (𝐴 = 𝑥𝐴 = 𝐵))
87adantr 466 . . . . . . . . 9 ((𝑥 = 𝐵𝑦 = 𝐶) → (𝐴 = 𝑥𝐴 = 𝐵))
96, 8syl5rbbr 275 . . . . . . . 8 ((𝑥 = 𝐵𝑦 = 𝐶) → (𝐴 = 𝐵𝑥 = 𝐴))
109notbid 307 . . . . . . 7 ((𝑥 = 𝐵𝑦 = 𝐶) → (¬ 𝐴 = 𝐵 ↔ ¬ 𝑥 = 𝐴))
1110biimpcd 239 . . . . . 6 𝐴 = 𝐵 → ((𝑥 = 𝐵𝑦 = 𝐶) → ¬ 𝑥 = 𝐴))
125, 11sylbi 207 . . . . 5 (𝐴𝐵 → ((𝑥 = 𝐵𝑦 = 𝐶) → ¬ 𝑥 = 𝐴))
13123ad2ant3 1128 . . . 4 ((𝐶𝑆𝐵𝑆𝐴𝐵) → ((𝑥 = 𝐵𝑦 = 𝐶) → ¬ 𝑥 = 𝐴))
1413imp 393 . . 3 (((𝐶𝑆𝐵𝑆𝐴𝐵) ∧ (𝑥 = 𝐵𝑦 = 𝐶)) → ¬ 𝑥 = 𝐴)
1514iffalsed 4234 . 2 (((𝐶𝑆𝐵𝑆𝐴𝐵) ∧ (𝑥 = 𝐵𝑦 = 𝐶)) → if(𝑥 = 𝐴, 𝐴, 𝐵) = 𝐵)
16 simp2 1130 . 2 ((𝐶𝑆𝐵𝑆𝐴𝐵) → 𝐵𝑆)
17 simp1 1129 . 2 ((𝐶𝑆𝐵𝑆𝐴𝐵) → 𝐶𝑆)
184, 15, 16, 17, 16ovmpt2d 6934 1 ((𝐶𝑆𝐵𝑆𝐴𝐵) → (𝐵 𝐶) = 𝐵)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∧ wa 382   ∧ w3a 1070   = wceq 1630   ∈ wcel 2144   ≠ wne 2942  ifcif 4223  {cpr 4316  ‘cfv 6031  (class class class)co 6792   ↦ cmpt2 6794  Basecbs 16063  +gcplusg 16148 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750  ax-sep 4912  ax-nul 4920  ax-pr 5034 This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-3an 1072  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-eu 2621  df-mo 2622  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-ne 2943  df-ral 3065  df-rex 3066  df-rab 3069  df-v 3351  df-sbc 3586  df-dif 3724  df-un 3726  df-in 3728  df-ss 3735  df-nul 4062  df-if 4224  df-sn 4315  df-pr 4317  df-op 4321  df-uni 4573  df-br 4785  df-opab 4845  df-id 5157  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-iota 5994  df-fun 6033  df-fv 6039  df-ov 6795  df-oprab 6796  df-mpt2 6797 This theorem is referenced by:  sgrp2rid2  17620  sgrp2nmndlem4  17622  sgrp2nmndlem5  17623
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