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Theorem issubgrpd2 19096

Description: Prove a subgroup by closure (definition version). (Contributed by Stefan O'Rear, 7-Dec-2014.)

**Hypotheses**
Ref	Expression
issubgrpd.s	⊢ (𝜑 → 𝑆 = (𝐼 ↾_s 𝐷))
issubgrpd.z	⊢ (𝜑 → 0 = (0_g‘𝐼))
issubgrpd.p	⊢ (𝜑 → + = (+_g‘𝐼))
issubgrpd.ss	⊢ (𝜑 → 𝐷 ⊆ (Base‘𝐼))
issubgrpd.zcl	⊢ (𝜑 → 0 ∈ 𝐷)
issubgrpd.acl	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷 ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷)
issubgrpd.ncl	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ((inv_g‘𝐼)‘𝑥) ∈ 𝐷)
issubgrpd.g	⊢ (𝜑 → 𝐼 ∈ Grp)

**Assertion**
Ref	Expression
issubgrpd2	⊢ (𝜑 → 𝐷 ∈ (SubGrp‘𝐼))

Distinct variable groups: 𝑥,𝑦, 0 𝑥,𝐷,𝑦 𝑥,𝐼,𝑦 𝑥, + ,𝑦 𝜑,𝑥,𝑦 𝑥,𝑆,𝑦

**Proof of Theorem issubgrpd2**
Step	Hyp	Ref	Expression
1		issubgrpd.ss	. 2 ⊢ (𝜑 → 𝐷 ⊆ (Base‘𝐼))
2		issubgrpd.zcl	. . 3 ⊢ (𝜑 → 0 ∈ 𝐷)
3	2	ne0d 4336	. 2 ⊢ (𝜑 → 𝐷 ≠ ∅)
4		issubgrpd.p	. . . . . . . 8 ⊢ (𝜑 → + = (+_g‘𝐼))
5	4	oveqd 7437	. . . . . . 7 ⊢ (𝜑 → (𝑥 + 𝑦) = (𝑥(+_g‘𝐼)𝑦))
6	5	ad2antrr 725	. . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) = (𝑥(+_g‘𝐼)𝑦))
7		issubgrpd.acl	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷 ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷)
8	7	3expa 1116	. . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷)
9	6, 8	eqeltrrd 2830	. . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥(+_g‘𝐼)𝑦) ∈ 𝐷)
10	9	ralrimiva 3143	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ∀𝑦 ∈ 𝐷 (𝑥(+_g‘𝐼)𝑦) ∈ 𝐷)
11		issubgrpd.ncl	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → ((inv_g‘𝐼)‘𝑥) ∈ 𝐷)
12	10, 11	jca 511	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (∀𝑦 ∈ 𝐷 (𝑥(+_g‘𝐼)𝑦) ∈ 𝐷 ∧ ((inv_g‘𝐼)‘𝑥) ∈ 𝐷))
13	12	ralrimiva 3143	. 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+_g‘𝐼)𝑦) ∈ 𝐷 ∧ ((inv_g‘𝐼)‘𝑥) ∈ 𝐷))
14		issubgrpd.g	. . 3 ⊢ (𝜑 → 𝐼 ∈ Grp)
15		eqid 2728	. . . 4 ⊢ (Base‘𝐼) = (Base‘𝐼)
16		eqid 2728	. . . 4 ⊢ (+_g‘𝐼) = (+_g‘𝐼)
17		eqid 2728	. . . 4 ⊢ (inv_g‘𝐼) = (inv_g‘𝐼)
18	15, 16, 17	issubg2 19095	. . 3 ⊢ (𝐼 ∈ Grp → (𝐷 ∈ (SubGrp‘𝐼) ↔ (𝐷 ⊆ (Base‘𝐼) ∧ 𝐷 ≠ ∅ ∧ ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+_g‘𝐼)𝑦) ∈ 𝐷 ∧ ((inv_g‘𝐼)‘𝑥) ∈ 𝐷))))
19	14, 18	syl 17	. 2 ⊢ (𝜑 → (𝐷 ∈ (SubGrp‘𝐼) ↔ (𝐷 ⊆ (Base‘𝐼) ∧ 𝐷 ≠ ∅ ∧ ∀𝑥 ∈ 𝐷 (∀𝑦 ∈ 𝐷 (𝑥(+_g‘𝐼)𝑦) ∈ 𝐷 ∧ ((inv_g‘𝐼)‘𝑥) ∈ 𝐷))))
20	1, 3, 13, 19	mpbir3and 1340	1 ⊢ (𝜑 → 𝐷 ∈ (SubGrp‘𝐼))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∧ w3a 1085 = wceq 1534 ∈ wcel 2099 ≠ wne 2937 ∀wral 3058 ⊆ wss 3947 ∅c0 4323 ‘cfv 6548 (class class class)co 7420 Basecbs 17179 ↾_s cress 17208 +_gcplusg 17232 0_gc0g 17420 Grpcgrp 18889 inv_gcminusg 18890 SubGrpcsubg 19074

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11194 ax-resscn 11195 ax-1cn 11196 ax-icn 11197 ax-addcl 11198 ax-addrcl 11199 ax-mulcl 11200 ax-mulrcl 11201 ax-mulcom 11202 ax-addass 11203 ax-mulass 11204 ax-distr 11205 ax-i2m1 11206 ax-1ne0 11207 ax-1rid 11208 ax-rnegex 11209 ax-rrecex 11210 ax-cnre 11211 ax-pre-lttri 11212 ax-pre-lttrn 11213 ax-pre-ltadd 11214 ax-pre-mulgt0 11215

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3373 df-reu 3374 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-iun 4998 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5633 df-we 5635 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-pred 6305 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-riota 7376 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7871 df-2nd 7994 df-frecs 8286 df-wrecs 8317 df-recs 8391 df-rdg 8430 df-er 8724 df-en 8964 df-dom 8965 df-sdom 8966 df-pnf 11280 df-mnf 11281 df-xr 11282 df-ltxr 11283 df-le 11284 df-sub 11476 df-neg 11477 df-nn 12243 df-2 12305 df-sets 17132 df-slot 17150 df-ndx 17162 df-base 17180 df-ress 17209 df-plusg 17245 df-0g 17422 df-mgm 18599 df-sgrp 18678 df-mnd 18694 df-grp 18892 df-minusg 18893 df-subg 19077

This theorem is referenced by: issubgrpd 19097 symgsssg 19421 symgfisg 19422 issubrgd 21081 dsmmsubg 21676 nsgmgclem 33121

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