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| Mirrors > Home > ILE Home > Th. List > subrngmcl | GIF version | ||
| Description: A subgroup is closed under multiplication. (Contributed by Mario Carneiro, 2-Dec-2014.) Generalization of subrgmcl 13865. (Revised by AV, 14-Feb-2025.) |
| Ref | Expression |
|---|---|
| subrngmcl.p | ⊢ · = (.r‘𝑅) |
| Ref | Expression |
|---|---|
| subrngmcl | ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑋 · 𝑌) ∈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2196 | . . . . 5 ⊢ (𝑅 ↾s 𝐴) = (𝑅 ↾s 𝐴) | |
| 2 | 1 | subrngrng 13834 | . . . 4 ⊢ (𝐴 ∈ (SubRng‘𝑅) → (𝑅 ↾s 𝐴) ∈ Rng) |
| 3 | 2 | 3ad2ant1 1020 | . . 3 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑅 ↾s 𝐴) ∈ Rng) |
| 4 | simp2 1000 | . . . 4 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑋 ∈ 𝐴) | |
| 5 | 1 | subrngbas 13838 | . . . . 5 ⊢ (𝐴 ∈ (SubRng‘𝑅) → 𝐴 = (Base‘(𝑅 ↾s 𝐴))) |
| 6 | 5 | 3ad2ant1 1020 | . . . 4 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝐴 = (Base‘(𝑅 ↾s 𝐴))) |
| 7 | 4, 6 | eleqtrd 2275 | . . 3 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑋 ∈ (Base‘(𝑅 ↾s 𝐴))) |
| 8 | simp3 1001 | . . . 4 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑌 ∈ 𝐴) | |
| 9 | 8, 6 | eleqtrd 2275 | . . 3 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑌 ∈ (Base‘(𝑅 ↾s 𝐴))) |
| 10 | eqid 2196 | . . . 4 ⊢ (Base‘(𝑅 ↾s 𝐴)) = (Base‘(𝑅 ↾s 𝐴)) | |
| 11 | eqid 2196 | . . . 4 ⊢ (.r‘(𝑅 ↾s 𝐴)) = (.r‘(𝑅 ↾s 𝐴)) | |
| 12 | 10, 11 | rngcl 13576 | . . 3 ⊢ (((𝑅 ↾s 𝐴) ∈ Rng ∧ 𝑋 ∈ (Base‘(𝑅 ↾s 𝐴)) ∧ 𝑌 ∈ (Base‘(𝑅 ↾s 𝐴))) → (𝑋(.r‘(𝑅 ↾s 𝐴))𝑌) ∈ (Base‘(𝑅 ↾s 𝐴))) |
| 13 | 3, 7, 9, 12 | syl3anc 1249 | . 2 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑋(.r‘(𝑅 ↾s 𝐴))𝑌) ∈ (Base‘(𝑅 ↾s 𝐴))) |
| 14 | subrngrcl 13835 | . . . . 5 ⊢ (𝐴 ∈ (SubRng‘𝑅) → 𝑅 ∈ Rng) | |
| 15 | subrngmcl.p | . . . . . 6 ⊢ · = (.r‘𝑅) | |
| 16 | 1, 15 | ressmulrg 12847 | . . . . 5 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑅 ∈ Rng) → · = (.r‘(𝑅 ↾s 𝐴))) |
| 17 | 14, 16 | mpdan 421 | . . . 4 ⊢ (𝐴 ∈ (SubRng‘𝑅) → · = (.r‘(𝑅 ↾s 𝐴))) |
| 18 | 17 | 3ad2ant1 1020 | . . 3 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → · = (.r‘(𝑅 ↾s 𝐴))) |
| 19 | 18 | oveqd 5942 | . 2 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑋 · 𝑌) = (𝑋(.r‘(𝑅 ↾s 𝐴))𝑌)) |
| 20 | 13, 19, 6 | 3eltr4d 2280 | 1 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑋 · 𝑌) ∈ 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ w3a 980 = wceq 1364 ∈ wcel 2167 ‘cfv 5259 (class class class)co 5925 Basecbs 12703 ↾s cress 12704 .rcmulr 12781 Rngcrng 13564 SubRngcsubrng 13829 |
| 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 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-13 2169 ax-14 2170 ax-ext 2178 ax-sep 4152 ax-pow 4208 ax-pr 4243 ax-un 4469 ax-setind 4574 ax-cnex 7987 ax-resscn 7988 ax-1cn 7989 ax-1re 7990 ax-icn 7991 ax-addcl 7992 ax-addrcl 7993 ax-mulcl 7994 ax-addcom 7996 ax-addass 7998 ax-i2m1 8001 ax-0lt1 8002 ax-0id 8004 ax-rnegex 8005 ax-pre-ltirr 8008 ax-pre-lttrn 8010 ax-pre-ltadd 8012 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-nel 2463 df-ral 2480 df-rex 2481 df-rab 2484 df-v 2765 df-sbc 2990 df-csb 3085 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-nul 3452 df-pw 3608 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-int 3876 df-br 4035 df-opab 4096 df-mpt 4097 df-id 4329 df-xp 4670 df-rel 4671 df-cnv 4672 df-co 4673 df-dm 4674 df-rn 4675 df-res 4676 df-ima 4677 df-iota 5220 df-fun 5261 df-fn 5262 df-fv 5267 df-ov 5928 df-oprab 5929 df-mpo 5930 df-pnf 8080 df-mnf 8081 df-ltxr 8083 df-inn 9008 df-2 9066 df-3 9067 df-ndx 12706 df-slot 12707 df-base 12709 df-sets 12710 df-iress 12711 df-plusg 12793 df-mulr 12794 df-mgm 13058 df-sgrp 13104 df-subg 13376 df-abl 13493 df-mgp 13553 df-rng 13565 df-subrng 13830 |
| This theorem is referenced by: issubrng2 13842 subrngintm 13844 |
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