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Theorem quselbasg 13788

Description: Membership in the base set of a quotient group. (Contributed by AV, 1-Mar-2025.)

**Hypotheses**
Ref	Expression
quselbas.e	⊢ ∼ = (𝐺 ~_QG 𝑆)
quselbas.u	⊢ 𝑈 = (𝐺 /_s ∼ )
quselbas.b	⊢ 𝐵 = (Base‘𝐺)

**Assertion**
Ref	Expression
quselbasg	⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → (𝑋 ∈ (Base‘𝑈) ↔ ∃𝑥 ∈ 𝐵 𝑋 = [𝑥] ∼ ))

Distinct variable groups: 𝑥,𝐵 𝑥,𝑋 𝑥, ∼ Allowed substitution hints: 𝑆(𝑥) 𝑈(𝑥) 𝐺(𝑥) 𝑉(𝑥) 𝑊(𝑥) 𝑍(𝑥)

**Proof of Theorem quselbasg**
Step	Hyp	Ref	Expression
1		quselbas.u	. . . . . 6 ⊢ 𝑈 = (𝐺 /_s ∼ )
2	1	a1i 9	. . . . 5 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → 𝑈 = (𝐺 /_s ∼ ))
3		quselbas.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝐺)
4	3	a1i 9	. . . . 5 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → 𝐵 = (Base‘𝐺))
5		quselbas.e	. . . . . 6 ⊢ ∼ = (𝐺 ~_QG 𝑆)
6		eqgex 13779	. . . . . . 7 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑆 ∈ 𝑍) → (𝐺 ~_QG 𝑆) ∈ V)
7	6	3adant2 1040	. . . . . 6 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → (𝐺 ~_QG 𝑆) ∈ V)
8	5, 7	eqeltrid 2316	. . . . 5 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → ∼ ∈ V)
9		simp1 1021	. . . . 5 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → 𝐺 ∈ 𝑉)
10	2, 4, 8, 9	qusbas 13381	. . . 4 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → (𝐵 / ∼ ) = (Base‘𝑈))
11	10	eqcomd 2235	. . 3 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → (Base‘𝑈) = (𝐵 / ∼ ))
12	11	eleq2d 2299	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → (𝑋 ∈ (Base‘𝑈) ↔ 𝑋 ∈ (𝐵 / ∼ )))
13		elqsg 6745	. . 3 ⊢ (𝑋 ∈ 𝑊 → (𝑋 ∈ (𝐵 / ∼ ) ↔ ∃𝑥 ∈ 𝐵 𝑋 = [𝑥] ∼ ))
14	13	3ad2ant2 1043	. 2 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → (𝑋 ∈ (𝐵 / ∼ ) ↔ ∃𝑥 ∈ 𝐵 𝑋 = [𝑥] ∼ ))
15	12, 14	bitrd 188	1 ⊢ ((𝐺 ∈ 𝑉 ∧ 𝑋 ∈ 𝑊 ∧ 𝑆 ∈ 𝑍) → (𝑋 ∈ (Base‘𝑈) ↔ ∃𝑥 ∈ 𝐵 𝑋 = [𝑥] ∼ ))

Colors of variables: wff set class

Syntax hints: → wi 4 ↔ wb 105 ∧ w3a 1002 = wceq 1395 ∈ wcel 2200 ∃wrex 2509 Vcvv 2799 ‘cfv 5321 (class class class)co 6010 [cec 6691 / cqs 6692 Basecbs 13053 /_s cqus 13354 ~_QG cqg 13727

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4199 ax-sep 4202 ax-pow 4259 ax-pr 4294 ax-un 4525 ax-setind 4630 ax-cnex 8106 ax-resscn 8107 ax-1cn 8108 ax-1re 8109 ax-icn 8110 ax-addcl 8111 ax-addrcl 8112 ax-mulcl 8113 ax-addcom 8115 ax-addass 8117 ax-i2m1 8120 ax-0lt1 8121 ax-0id 8123 ax-rnegex 8124 ax-pre-ltirr 8127 ax-pre-lttrn 8129 ax-pre-ltadd 8131

This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-tp 3674 df-op 3675 df-uni 3889 df-int 3924 df-iun 3967 df-br 4084 df-opab 4146 df-mpt 4147 df-id 4385 df-xp 4726 df-rel 4727 df-cnv 4728 df-co 4729 df-dm 4730 df-rn 4731 df-res 4732 df-ima 4733 df-iota 5281 df-fun 5323 df-fn 5324 df-f 5325 df-f1 5326 df-fo 5327 df-f1o 5328 df-fv 5329 df-ov 6013 df-oprab 6014 df-mpo 6015 df-ec 6695 df-qs 6699 df-pnf 8199 df-mnf 8200 df-ltxr 8202 df-inn 9127 df-2 9185 df-3 9186 df-ndx 13056 df-slot 13057 df-base 13059 df-plusg 13144 df-mulr 13145 df-iimas 13356 df-qus 13357 df-eqg 13730

This theorem is referenced by: (None)

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