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Theorem dfgrp3mlem 12819
Description: Lemma for dfgrp3m 12820. (Contributed by AV, 28-Aug-2021.)
Hypotheses
Ref Expression
dfgrp3.b 𝐵 = (Base‘𝐺)
dfgrp3.p + = (+g𝐺)
Assertion
Ref Expression
dfgrp3mlem ((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → ∃𝑢𝐵𝑎𝐵 ((𝑢 + 𝑎) = 𝑎 ∧ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢))
Distinct variable groups:   𝐵,𝑎,𝑖,𝑙,𝑟,𝑢,𝑤,𝑥,𝑦   𝐺,𝑎,𝑖,𝑙,𝑟,𝑢,𝑤,𝑥,𝑦   + ,𝑎,𝑖,𝑙,𝑟,𝑢,𝑤,𝑥,𝑦

Proof of Theorem dfgrp3mlem
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 nfv 1522 . . 3 𝑤 𝐺 ∈ Smgrp
2 nfe1 1490 . . 3 𝑤𝑤 𝑤𝐵
3 nfv 1522 . . 3 𝑤𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)
41, 2, 3nf3an 1560 . 2 𝑤(𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦))
5 nfv 1522 . 2 𝑤𝑢𝐵𝑎𝐵 ((𝑢 + 𝑎) = 𝑎 ∧ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢)
6 simp2 994 . 2 ((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → ∃𝑤 𝑤𝐵)
7 oveq2 5865 . . . . . . . . . . 11 (𝑥 = 𝑤 → (𝑙 + 𝑥) = (𝑙 + 𝑤))
87eqeq1d 2180 . . . . . . . . . 10 (𝑥 = 𝑤 → ((𝑙 + 𝑥) = 𝑦 ↔ (𝑙 + 𝑤) = 𝑦))
98rexbidv 2472 . . . . . . . . 9 (𝑥 = 𝑤 → (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ↔ ∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦))
10 oveq1 5864 . . . . . . . . . . 11 (𝑥 = 𝑤 → (𝑥 + 𝑟) = (𝑤 + 𝑟))
1110eqeq1d 2180 . . . . . . . . . 10 (𝑥 = 𝑤 → ((𝑥 + 𝑟) = 𝑦 ↔ (𝑤 + 𝑟) = 𝑦))
1211rexbidv 2472 . . . . . . . . 9 (𝑥 = 𝑤 → (∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦 ↔ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦))
139, 12anbi12d 471 . . . . . . . 8 (𝑥 = 𝑤 → ((∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) ↔ (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦)))
1413ralbidv 2471 . . . . . . 7 (𝑥 = 𝑤 → (∀𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) ↔ ∀𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦)))
1514rspcv 2831 . . . . . 6 (𝑤𝐵 → (∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) → ∀𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦)))
16 eqeq2 2181 . . . . . . . . . . 11 (𝑦 = 𝑤 → ((𝑙 + 𝑤) = 𝑦 ↔ (𝑙 + 𝑤) = 𝑤))
1716rexbidv 2472 . . . . . . . . . 10 (𝑦 = 𝑤 → (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ↔ ∃𝑙𝐵 (𝑙 + 𝑤) = 𝑤))
18 eqeq2 2181 . . . . . . . . . . 11 (𝑦 = 𝑤 → ((𝑤 + 𝑟) = 𝑦 ↔ (𝑤 + 𝑟) = 𝑤))
1918rexbidv 2472 . . . . . . . . . 10 (𝑦 = 𝑤 → (∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦 ↔ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑤))
2017, 19anbi12d 471 . . . . . . . . 9 (𝑦 = 𝑤 → ((∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦) ↔ (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑤 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑤)))
2120rspcva 2833 . . . . . . . 8 ((𝑤𝐵 ∧ ∀𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦)) → (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑤 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑤))
22 oveq1 5864 . . . . . . . . . . . 12 (𝑙 = 𝑢 → (𝑙 + 𝑤) = (𝑢 + 𝑤))
2322eqeq1d 2180 . . . . . . . . . . 11 (𝑙 = 𝑢 → ((𝑙 + 𝑤) = 𝑤 ↔ (𝑢 + 𝑤) = 𝑤))
2423cbvrexvw 2702 . . . . . . . . . 10 (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑤 ↔ ∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤)
2524biimpi 119 . . . . . . . . 9 (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑤 → ∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤)
2625adantr 274 . . . . . . . 8 ((∃𝑙𝐵 (𝑙 + 𝑤) = 𝑤 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑤) → ∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤)
2721, 26syl 14 . . . . . . 7 ((𝑤𝐵 ∧ ∀𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦)) → ∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤)
2827ex 114 . . . . . 6 (𝑤𝐵 → (∀𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦) → ∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤))
2915, 28syldc 46 . . . . 5 (∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) → (𝑤𝐵 → ∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤))
30293ad2ant3 1016 . . . 4 ((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → (𝑤𝐵 → ∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤))
3130imp 123 . . 3 (((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) → ∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤)
32 eqeq2 2181 . . . . . . . . . . . . . . . 16 (𝑦 = 𝑎 → ((𝑙 + 𝑤) = 𝑦 ↔ (𝑙 + 𝑤) = 𝑎))
3332rexbidv 2472 . . . . . . . . . . . . . . 15 (𝑦 = 𝑎 → (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ↔ ∃𝑙𝐵 (𝑙 + 𝑤) = 𝑎))
34 eqeq2 2181 . . . . . . . . . . . . . . . 16 (𝑦 = 𝑎 → ((𝑤 + 𝑟) = 𝑦 ↔ (𝑤 + 𝑟) = 𝑎))
3534rexbidv 2472 . . . . . . . . . . . . . . 15 (𝑦 = 𝑎 → (∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦 ↔ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎))
3633, 35anbi12d 471 . . . . . . . . . . . . . 14 (𝑦 = 𝑎 → ((∃𝑙𝐵 (𝑙 + 𝑤) = 𝑦 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑦) ↔ (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑎 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎)))
3713, 36rspc2va 2849 . . . . . . . . . . . . 13 (((𝑤𝐵𝑎𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → (∃𝑙𝐵 (𝑙 + 𝑤) = 𝑎 ∧ ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎))
3837simprd 113 . . . . . . . . . . . 12 (((𝑤𝐵𝑎𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎)
3938expcom 115 . . . . . . . . . . 11 (∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) → ((𝑤𝐵𝑎𝐵) → ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎))
40393ad2ant3 1016 . . . . . . . . . 10 ((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → ((𝑤𝐵𝑎𝐵) → ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎))
4140impl 378 . . . . . . . . 9 ((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑎𝐵) → ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎)
4241ad2ant2r 507 . . . . . . . 8 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑎𝐵 ∧ (𝑢 + 𝑤) = 𝑤)) → ∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎)
43 oveq2 5865 . . . . . . . . . . . 12 (𝑟 = 𝑧 → (𝑤 + 𝑟) = (𝑤 + 𝑧))
4443eqeq1d 2180 . . . . . . . . . . 11 (𝑟 = 𝑧 → ((𝑤 + 𝑟) = 𝑎 ↔ (𝑤 + 𝑧) = 𝑎))
4544cbvrexvw 2702 . . . . . . . . . 10 (∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎 ↔ ∃𝑧𝐵 (𝑤 + 𝑧) = 𝑎)
46 simpll1 1032 . . . . . . . . . . . . . . . 16 ((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) → 𝐺 ∈ Smgrp)
4746adantr 274 . . . . . . . . . . . . . . 15 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ ((𝑢 + 𝑤) = 𝑤𝑧𝐵)) → 𝐺 ∈ Smgrp)
48 simplr 526 . . . . . . . . . . . . . . 15 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ ((𝑢 + 𝑤) = 𝑤𝑧𝐵)) → 𝑢𝐵)
49 simpllr 530 . . . . . . . . . . . . . . 15 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ ((𝑢 + 𝑤) = 𝑤𝑧𝐵)) → 𝑤𝐵)
50 simprr 528 . . . . . . . . . . . . . . 15 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ ((𝑢 + 𝑤) = 𝑤𝑧𝐵)) → 𝑧𝐵)
51 dfgrp3.b . . . . . . . . . . . . . . . 16 𝐵 = (Base‘𝐺)
52 dfgrp3.p . . . . . . . . . . . . . . . 16 + = (+g𝐺)
5351, 52sgrpass 12671 . . . . . . . . . . . . . . 15 ((𝐺 ∈ Smgrp ∧ (𝑢𝐵𝑤𝐵𝑧𝐵)) → ((𝑢 + 𝑤) + 𝑧) = (𝑢 + (𝑤 + 𝑧)))
5447, 48, 49, 50, 53syl13anc 1236 . . . . . . . . . . . . . 14 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ ((𝑢 + 𝑤) = 𝑤𝑧𝐵)) → ((𝑢 + 𝑤) + 𝑧) = (𝑢 + (𝑤 + 𝑧)))
55 simprl 527 . . . . . . . . . . . . . . 15 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ ((𝑢 + 𝑤) = 𝑤𝑧𝐵)) → (𝑢 + 𝑤) = 𝑤)
5655oveq1d 5872 . . . . . . . . . . . . . 14 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ ((𝑢 + 𝑤) = 𝑤𝑧𝐵)) → ((𝑢 + 𝑤) + 𝑧) = (𝑤 + 𝑧))
5754, 56eqtr3d 2206 . . . . . . . . . . . . 13 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ ((𝑢 + 𝑤) = 𝑤𝑧𝐵)) → (𝑢 + (𝑤 + 𝑧)) = (𝑤 + 𝑧))
5857anassrs 398 . . . . . . . . . . . 12 ((((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑢 + 𝑤) = 𝑤) ∧ 𝑧𝐵) → (𝑢 + (𝑤 + 𝑧)) = (𝑤 + 𝑧))
59 oveq2 5865 . . . . . . . . . . . . 13 ((𝑤 + 𝑧) = 𝑎 → (𝑢 + (𝑤 + 𝑧)) = (𝑢 + 𝑎))
60 id 19 . . . . . . . . . . . . 13 ((𝑤 + 𝑧) = 𝑎 → (𝑤 + 𝑧) = 𝑎)
6159, 60eqeq12d 2186 . . . . . . . . . . . 12 ((𝑤 + 𝑧) = 𝑎 → ((𝑢 + (𝑤 + 𝑧)) = (𝑤 + 𝑧) ↔ (𝑢 + 𝑎) = 𝑎))
6258, 61syl5ibcom 154 . . . . . . . . . . 11 ((((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑢 + 𝑤) = 𝑤) ∧ 𝑧𝐵) → ((𝑤 + 𝑧) = 𝑎 → (𝑢 + 𝑎) = 𝑎))
6362rexlimdva 2588 . . . . . . . . . 10 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑢 + 𝑤) = 𝑤) → (∃𝑧𝐵 (𝑤 + 𝑧) = 𝑎 → (𝑢 + 𝑎) = 𝑎))
6445, 63syl5bi 151 . . . . . . . . 9 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑢 + 𝑤) = 𝑤) → (∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎 → (𝑢 + 𝑎) = 𝑎))
6564adantrl 476 . . . . . . . 8 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑎𝐵 ∧ (𝑢 + 𝑤) = 𝑤)) → (∃𝑟𝐵 (𝑤 + 𝑟) = 𝑎 → (𝑢 + 𝑎) = 𝑎))
6642, 65mpd 13 . . . . . . 7 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑎𝐵 ∧ (𝑢 + 𝑤) = 𝑤)) → (𝑢 + 𝑎) = 𝑎)
67 oveq2 5865 . . . . . . . . . . . . . . . . . . . 20 (𝑥 = 𝑎 → (𝑙 + 𝑥) = (𝑙 + 𝑎))
6867eqeq1d 2180 . . . . . . . . . . . . . . . . . . 19 (𝑥 = 𝑎 → ((𝑙 + 𝑥) = 𝑦 ↔ (𝑙 + 𝑎) = 𝑦))
6968rexbidv 2472 . . . . . . . . . . . . . . . . . 18 (𝑥 = 𝑎 → (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ↔ ∃𝑙𝐵 (𝑙 + 𝑎) = 𝑦))
70 oveq1 5864 . . . . . . . . . . . . . . . . . . . 20 (𝑥 = 𝑎 → (𝑥 + 𝑟) = (𝑎 + 𝑟))
7170eqeq1d 2180 . . . . . . . . . . . . . . . . . . 19 (𝑥 = 𝑎 → ((𝑥 + 𝑟) = 𝑦 ↔ (𝑎 + 𝑟) = 𝑦))
7271rexbidv 2472 . . . . . . . . . . . . . . . . . 18 (𝑥 = 𝑎 → (∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦 ↔ ∃𝑟𝐵 (𝑎 + 𝑟) = 𝑦))
7369, 72anbi12d 471 . . . . . . . . . . . . . . . . 17 (𝑥 = 𝑎 → ((∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) ↔ (∃𝑙𝐵 (𝑙 + 𝑎) = 𝑦 ∧ ∃𝑟𝐵 (𝑎 + 𝑟) = 𝑦)))
74 eqeq2 2181 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑢 → ((𝑙 + 𝑎) = 𝑦 ↔ (𝑙 + 𝑎) = 𝑢))
7574rexbidv 2472 . . . . . . . . . . . . . . . . . 18 (𝑦 = 𝑢 → (∃𝑙𝐵 (𝑙 + 𝑎) = 𝑦 ↔ ∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢))
76 eqeq2 2181 . . . . . . . . . . . . . . . . . . 19 (𝑦 = 𝑢 → ((𝑎 + 𝑟) = 𝑦 ↔ (𝑎 + 𝑟) = 𝑢))
7776rexbidv 2472 . . . . . . . . . . . . . . . . . 18 (𝑦 = 𝑢 → (∃𝑟𝐵 (𝑎 + 𝑟) = 𝑦 ↔ ∃𝑟𝐵 (𝑎 + 𝑟) = 𝑢))
7875, 77anbi12d 471 . . . . . . . . . . . . . . . . 17 (𝑦 = 𝑢 → ((∃𝑙𝐵 (𝑙 + 𝑎) = 𝑦 ∧ ∃𝑟𝐵 (𝑎 + 𝑟) = 𝑦) ↔ (∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢 ∧ ∃𝑟𝐵 (𝑎 + 𝑟) = 𝑢)))
7973, 78rspc2va 2849 . . . . . . . . . . . . . . . 16 (((𝑎𝐵𝑢𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → (∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢 ∧ ∃𝑟𝐵 (𝑎 + 𝑟) = 𝑢))
8079simpld 111 . . . . . . . . . . . . . . 15 (((𝑎𝐵𝑢𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → ∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢)
8180ex 114 . . . . . . . . . . . . . 14 ((𝑎𝐵𝑢𝐵) → (∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) → ∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢))
8281ancoms 266 . . . . . . . . . . . . 13 ((𝑢𝐵𝑎𝐵) → (∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) → ∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢))
8382com12 30 . . . . . . . . . . . 12 (∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦) → ((𝑢𝐵𝑎𝐵) → ∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢))
84833ad2ant3 1016 . . . . . . . . . . 11 ((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → ((𝑢𝐵𝑎𝐵) → ∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢))
8584impl 378 . . . . . . . . . 10 ((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑢𝐵) ∧ 𝑎𝐵) → ∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢)
86 oveq1 5864 . . . . . . . . . . . 12 (𝑙 = 𝑖 → (𝑙 + 𝑎) = (𝑖 + 𝑎))
8786eqeq1d 2180 . . . . . . . . . . 11 (𝑙 = 𝑖 → ((𝑙 + 𝑎) = 𝑢 ↔ (𝑖 + 𝑎) = 𝑢))
8887cbvrexvw 2702 . . . . . . . . . 10 (∃𝑙𝐵 (𝑙 + 𝑎) = 𝑢 ↔ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢)
8985, 88sylib 121 . . . . . . . . 9 ((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑢𝐵) ∧ 𝑎𝐵) → ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢)
9089adantllr 479 . . . . . . . 8 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ 𝑎𝐵) → ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢)
9190adantrr 477 . . . . . . 7 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑎𝐵 ∧ (𝑢 + 𝑤) = 𝑤)) → ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢)
9266, 91jca 304 . . . . . 6 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ (𝑎𝐵 ∧ (𝑢 + 𝑤) = 𝑤)) → ((𝑢 + 𝑎) = 𝑎 ∧ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢))
9392expr 373 . . . . 5 (((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) ∧ 𝑎𝐵) → ((𝑢 + 𝑤) = 𝑤 → ((𝑢 + 𝑎) = 𝑎 ∧ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢)))
9493ralrimdva 2551 . . . 4 ((((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) ∧ 𝑢𝐵) → ((𝑢 + 𝑤) = 𝑤 → ∀𝑎𝐵 ((𝑢 + 𝑎) = 𝑎 ∧ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢)))
9594reximdva 2573 . . 3 (((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) → (∃𝑢𝐵 (𝑢 + 𝑤) = 𝑤 → ∃𝑢𝐵𝑎𝐵 ((𝑢 + 𝑎) = 𝑎 ∧ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢)))
9631, 95mpd 13 . 2 (((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) ∧ 𝑤𝐵) → ∃𝑢𝐵𝑎𝐵 ((𝑢 + 𝑎) = 𝑎 ∧ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢))
974, 5, 6, 96exlimdd 1866 1 ((𝐺 ∈ Smgrp ∧ ∃𝑤 𝑤𝐵 ∧ ∀𝑥𝐵𝑦𝐵 (∃𝑙𝐵 (𝑙 + 𝑥) = 𝑦 ∧ ∃𝑟𝐵 (𝑥 + 𝑟) = 𝑦)) → ∃𝑢𝐵𝑎𝐵 ((𝑢 + 𝑎) = 𝑎 ∧ ∃𝑖𝐵 (𝑖 + 𝑎) = 𝑢))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  w3a 974   = wceq 1349  wex 1486  wcel 2142  wral 2449  wrex 2450  cfv 5200  (class class class)co 5857  Basecbs 12420  +gcplusg 12484  Smgrpcsgrp 12664
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 705  ax-5 1441  ax-7 1442  ax-gen 1443  ax-ie1 1487  ax-ie2 1488  ax-8 1498  ax-10 1499  ax-11 1500  ax-i12 1501  ax-bndl 1503  ax-4 1504  ax-17 1520  ax-i9 1524  ax-ial 1528  ax-i5r 1529  ax-13 2144  ax-14 2145  ax-ext 2153  ax-sep 4108  ax-pow 4161  ax-pr 4195  ax-un 4419  ax-cnex 7869  ax-resscn 7870  ax-1re 7872  ax-addrcl 7875
This theorem depends on definitions:  df-bi 116  df-3an 976  df-tru 1352  df-nf 1455  df-sb 1757  df-eu 2023  df-mo 2024  df-clab 2158  df-cleq 2164  df-clel 2167  df-nfc 2302  df-ral 2454  df-rex 2455  df-rab 2458  df-v 2733  df-sbc 2957  df-un 3126  df-in 3128  df-ss 3135  df-pw 3569  df-sn 3590  df-pr 3591  df-op 3593  df-uni 3798  df-int 3833  df-br 3991  df-opab 4052  df-mpt 4053  df-id 4279  df-xp 4618  df-rel 4619  df-cnv 4620  df-co 4621  df-dm 4622  df-rn 4623  df-res 4624  df-iota 5162  df-fun 5202  df-fn 5203  df-fv 5208  df-ov 5860  df-inn 8883  df-2 8941  df-ndx 12423  df-slot 12424  df-base 12426  df-plusg 12497  df-sgrp 12665
This theorem is referenced by:  dfgrp3m  12820
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