issubgrpd2 - Metamath Proof Explorer

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Theorem issubgrpd2 18771

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 4269	. 2 ⊢ (𝜑 → 𝐷 ≠ ∅)
4		issubgrpd.p	. . . . . . . 8 ⊢ (𝜑 → + = (+_g‘𝐼))
5	4	oveqd 7292	. . . . . . 7 ⊢ (𝜑 → (𝑥 + 𝑦) = (𝑥(+_g‘𝐼)𝑦))
6	5	ad2antrr 723	. . . . . 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 1117	. . . . . 6 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥 + 𝑦) ∈ 𝐷)
9	6, 8	eqeltrrd 2840	. . . . 5 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝐷) ∧ 𝑦 ∈ 𝐷) → (𝑥(+_g‘𝐼)𝑦) ∈ 𝐷)
10	9	ralrimiva 3103	. . . 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 512	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐷) → (∀𝑦 ∈ 𝐷 (𝑥(+_g‘𝐼)𝑦) ∈ 𝐷 ∧ ((inv_g‘𝐼)‘𝑥) ∈ 𝐷))
13	12	ralrimiva 3103	. 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 2738	. . . 4 ⊢ (Base‘𝐼) = (Base‘𝐼)
16		eqid 2738	. . . 4 ⊢ (+_g‘𝐼) = (+_g‘𝐼)
17		eqid 2738	. . . 4 ⊢ (inv_g‘𝐼) = (inv_g‘𝐼)
18	15, 16, 17	issubg2 18770	. . 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 1341	1 ⊢ (𝜑 → 𝐷 ∈ (SubGrp‘𝐼))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 ∀wral 3064 ⊆ wss 3887 ∅c0 4256 ‘cfv 6433 (class class class)co 7275 Basecbs 16912 ↾_s cress 16941 +_gcplusg 16962 0_gc0g 17150 Grpcgrp 18577 inv_gcminusg 18578 SubGrpcsubg 18749

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-nn 11974 df-2 12036 df-sets 16865 df-slot 16883 df-ndx 16895 df-base 16913 df-ress 16942 df-plusg 16975 df-0g 17152 df-mgm 18326 df-sgrp 18375 df-mnd 18386 df-grp 18580 df-minusg 18581 df-subg 18752

This theorem is referenced by: issubgrpd 18772 symgsssg 19075 symgfisg 19076 issubrngd2 20459 dsmmsubg 20950 nsgmgclem 31596

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