Theorem grpinvalem 13758

Description: Lemma for grpinva 13759. (Contributed by NM, 9-Aug-2013.)

Hypotheses

Ref	Expression
grpinva.c	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵) → (𝑥 + 𝑦) ∈ 𝐵)
grpinva.o	⊢ (𝜑 → 𝑂 ∈ 𝐵)
grpinva.i	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝑂 + 𝑥) = 𝑥)
grpinva.a	⊢ ((𝜑 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 + 𝑦) + 𝑧) = (𝑥 + (𝑦 + 𝑧)))
grpinva.r	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∃𝑦 ∈ 𝐵 (𝑦 + 𝑥) = 𝑂)
grpinvalem.x	⊢ ((𝜑 ∧ 𝜓) → 𝑋 ∈ 𝐵)
grpinvalem.e	⊢ ((𝜑 ∧ 𝜓) → (𝑋 + 𝑋) = 𝑋)

Assertion

Ref	Expression
grpinvalem	⊢ ((𝜑 ∧ 𝜓) → 𝑋 = 𝑂)

Distinct variable groups:   𝑥,𝑦,𝑧,𝐵   𝑥,𝑂,𝑦,𝑧   𝜑,𝑥,𝑦,𝑧   𝑥, + ,𝑦,𝑧   𝑦,𝑋,𝑧   𝜓,𝑦

Allowed substitution hints:   𝜓(𝑥, 𝑧)   𝑋(𝑥)

Proof of Theorem grpinvalem

Dummy variables 𝑢 𝑣 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		grpinva.r	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∃𝑦 ∈ 𝐵 (𝑦 + 𝑥) = 𝑂)
2	1	ralrimiva 2623	. . . 4 ⊢ (𝜑 → ∀𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 (𝑦 + 𝑥) = 𝑂)
3		oveq2 6093	. . . . . . 7 ⊢ (𝑥 = 𝑧 → (𝑦 + 𝑥) = (𝑦 + 𝑧))
4	3	eqeq1d 2247	. . . . . 6 ⊢ (𝑥 = 𝑧 → ((𝑦 + 𝑥) = 𝑂 ↔ (𝑦 + 𝑧) = 𝑂))
5	4	rexbidv 2551	. . . . 5 ⊢ (𝑥 = 𝑧 → (∃𝑦 ∈ 𝐵 (𝑦 + 𝑥) = 𝑂 ↔ ∃𝑦 ∈ 𝐵 (𝑦 + 𝑧) = 𝑂))
6	5	cbvralvw 2790	. . . 4 ⊢ (∀𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 (𝑦 + 𝑥) = 𝑂 ↔ ∀𝑧 ∈ 𝐵 ∃𝑦 ∈ 𝐵 (𝑦 + 𝑧) = 𝑂)
7	2, 6	sylib 122	. . 3 ⊢ (𝜑 → ∀𝑧 ∈ 𝐵 ∃𝑦 ∈ 𝐵 (𝑦 + 𝑧) = 𝑂)
8		grpinvalem.x	. . 3 ⊢ ((𝜑 ∧ 𝜓) → 𝑋 ∈ 𝐵)
9		oveq2 6093	. . . . . 6 ⊢ (𝑧 = 𝑋 → (𝑦 + 𝑧) = (𝑦 + 𝑋))
10	9	eqeq1d 2247	. . . . 5 ⊢ (𝑧 = 𝑋 → ((𝑦 + 𝑧) = 𝑂 ↔ (𝑦 + 𝑋) = 𝑂))
11	10	rexbidv 2551	. . . 4 ⊢ (𝑧 = 𝑋 → (∃𝑦 ∈ 𝐵 (𝑦 + 𝑧) = 𝑂 ↔ ∃𝑦 ∈ 𝐵 (𝑦 + 𝑋) = 𝑂))
12	11	rspccva 2928	. . 3 ⊢ ((∀𝑧 ∈ 𝐵 ∃𝑦 ∈ 𝐵 (𝑦 + 𝑧) = 𝑂 ∧ 𝑋 ∈ 𝐵) → ∃𝑦 ∈ 𝐵 (𝑦 + 𝑋) = 𝑂)
13	7, 8, 12	syl2an2r 603	. 2 ⊢ ((𝜑 ∧ 𝜓) → ∃𝑦 ∈ 𝐵 (𝑦 + 𝑋) = 𝑂)
14		grpinvalem.e	. . . . 5 ⊢ ((𝜑 ∧ 𝜓) → (𝑋 + 𝑋) = 𝑋)
15	14	oveq2d 6101	. . . 4 ⊢ ((𝜑 ∧ 𝜓) → (𝑦 + (𝑋 + 𝑋)) = (𝑦 + 𝑋))
16	15	adantr 276	. . 3 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → (𝑦 + (𝑋 + 𝑋)) = (𝑦 + 𝑋))
17		simprr 537	. . . . 5 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → (𝑦 + 𝑋) = 𝑂)
18	17	oveq1d 6100	. . . 4 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → ((𝑦 + 𝑋) + 𝑋) = (𝑂 + 𝑋))
19		grpinva.a	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐵 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵)) → ((𝑥 + 𝑦) + 𝑧) = (𝑥 + (𝑦 + 𝑧)))
20	19	caovassg 6248	. . . . . 6 ⊢ ((𝜑 ∧ (𝑢 ∈ 𝐵 ∧ 𝑣 ∈ 𝐵 ∧ 𝑤 ∈ 𝐵)) → ((𝑢 + 𝑣) + 𝑤) = (𝑢 + (𝑣 + 𝑤)))
21	20	ad4ant14 518	. . . . 5 ⊢ ((((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) ∧ (𝑢 ∈ 𝐵 ∧ 𝑣 ∈ 𝐵 ∧ 𝑤 ∈ 𝐵)) → ((𝑢 + 𝑣) + 𝑤) = (𝑢 + (𝑣 + 𝑤)))
22		simprl 535	. . . . 5 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → 𝑦 ∈ 𝐵)
23	8	adantr 276	. . . . 5 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → 𝑋 ∈ 𝐵)
24	21, 22, 23, 23	caovassd 6249	. . . 4 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → ((𝑦 + 𝑋) + 𝑋) = (𝑦 + (𝑋 + 𝑋)))
25		oveq2 6093	. . . . . . 7 ⊢ (𝑦 = 𝑋 → (𝑂 + 𝑦) = (𝑂 + 𝑋))
26		id 19	. . . . . . 7 ⊢ (𝑦 = 𝑋 → 𝑦 = 𝑋)
27	25, 26	eqeq12d 2253	. . . . . 6 ⊢ (𝑦 = 𝑋 → ((𝑂 + 𝑦) = 𝑦 ↔ (𝑂 + 𝑋) = 𝑋))
28		grpinva.i	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝑂 + 𝑥) = 𝑥)
29	28	ralrimiva 2623	. . . . . . . 8 ⊢ (𝜑 → ∀𝑥 ∈ 𝐵 (𝑂 + 𝑥) = 𝑥)
30		oveq2 6093	. . . . . . . . . 10 ⊢ (𝑥 = 𝑦 → (𝑂 + 𝑥) = (𝑂 + 𝑦))
31		id 19	. . . . . . . . . 10 ⊢ (𝑥 = 𝑦 → 𝑥 = 𝑦)
32	30, 31	eqeq12d 2253	. . . . . . . . 9 ⊢ (𝑥 = 𝑦 → ((𝑂 + 𝑥) = 𝑥 ↔ (𝑂 + 𝑦) = 𝑦))
33	32	cbvralvw 2790	. . . . . . . 8 ⊢ (∀𝑥 ∈ 𝐵 (𝑂 + 𝑥) = 𝑥 ↔ ∀𝑦 ∈ 𝐵 (𝑂 + 𝑦) = 𝑦)
34	29, 33	sylib 122	. . . . . . 7 ⊢ (𝜑 → ∀𝑦 ∈ 𝐵 (𝑂 + 𝑦) = 𝑦)
35	34	adantr 276	. . . . . 6 ⊢ ((𝜑 ∧ 𝜓) → ∀𝑦 ∈ 𝐵 (𝑂 + 𝑦) = 𝑦)
36	27, 35, 8	rspcdva 2934	. . . . 5 ⊢ ((𝜑 ∧ 𝜓) → (𝑂 + 𝑋) = 𝑋)
37	36	adantr 276	. . . 4 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → (𝑂 + 𝑋) = 𝑋)
38	18, 24, 37	3eqtr3d 2279	. . 3 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → (𝑦 + (𝑋 + 𝑋)) = 𝑋)
39	16, 38, 17	3eqtr3d 2279	. 2 ⊢ (((𝜑 ∧ 𝜓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑦 + 𝑋) = 𝑂)) → 𝑋 = 𝑂)
40	13, 39	rexlimddv 2673	1 ⊢ ((𝜑 ∧ 𝜓) → 𝑋 = 𝑂)

This proof depends on syntax axioms:   → wi 4   ∧ wa 104   ∧ w3a 1009   = wceq 1402   ∈ wcel 2209  ∀wral 2528  ∃wrex 2529  (class class class)co 6085

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-iota 5337  df-fv 5385  df-ov 6088

This theorem is used by:  grpinva  13759