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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 14524. (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 2238 | . . . . 5 ⊢ (𝑅 ↾s 𝐴) = (𝑅 ↾s 𝐴) | |
| 2 | 1 | subrngrng 14493 | . . . 4 ⊢ (𝐴 ∈ (SubRng‘𝑅) → (𝑅 ↾s 𝐴) ∈ Rng) |
| 3 | 2 | 3ad2ant1 1049 | . . 3 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑅 ↾s 𝐴) ∈ Rng) |
| 4 | simp2 1029 | . . . 4 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑋 ∈ 𝐴) | |
| 5 | 1 | subrngbas 14497 | . . . . 5 ⊢ (𝐴 ∈ (SubRng‘𝑅) → 𝐴 = (Base‘(𝑅 ↾s 𝐴))) |
| 6 | 5 | 3ad2ant1 1049 | . . . 4 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝐴 = (Base‘(𝑅 ↾s 𝐴))) |
| 7 | 4, 6 | eleqtrd 2317 | . . 3 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑋 ∈ (Base‘(𝑅 ↾s 𝐴))) |
| 8 | simp3 1030 | . . . 4 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑌 ∈ 𝐴) | |
| 9 | 8, 6 | eleqtrd 2317 | . . 3 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → 𝑌 ∈ (Base‘(𝑅 ↾s 𝐴))) |
| 10 | eqid 2238 | . . . 4 ⊢ (Base‘(𝑅 ↾s 𝐴)) = (Base‘(𝑅 ↾s 𝐴)) | |
| 11 | eqid 2238 | . . . 4 ⊢ (.r‘(𝑅 ↾s 𝐴)) = (.r‘(𝑅 ↾s 𝐴)) | |
| 12 | 10, 11 | rngcl 14226 | . . 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 1278 | . 2 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑋(.r‘(𝑅 ↾s 𝐴))𝑌) ∈ (Base‘(𝑅 ↾s 𝐴))) |
| 14 | subrngrcl 14494 | . . . . 5 ⊢ (𝐴 ∈ (SubRng‘𝑅) → 𝑅 ∈ Rng) | |
| 15 | subrngmcl.p | . . . . . 6 ⊢ · = (.r‘𝑅) | |
| 16 | 1, 15 | ressmulrg 13482 | . . . . 5 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑅 ∈ Rng) → · = (.r‘(𝑅 ↾s 𝐴))) |
| 17 | 14, 16 | mpdan 425 | . . . 4 ⊢ (𝐴 ∈ (SubRng‘𝑅) → · = (.r‘(𝑅 ↾s 𝐴))) |
| 18 | 17 | 3ad2ant1 1049 | . . 3 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → · = (.r‘(𝑅 ↾s 𝐴))) |
| 19 | 18 | oveqd 6096 | . 2 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑋 · 𝑌) = (𝑋(.r‘(𝑅 ↾s 𝐴))𝑌)) |
| 20 | 13, 19, 6 | 3eltr4d 2322 | 1 ⊢ ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋 ∈ 𝐴 ∧ 𝑌 ∈ 𝐴) → (𝑋 · 𝑌) ∈ 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ w3a 1009 = wceq 1402 ∈ wcel 2209 ‘cfv 5375 (class class class)co 6079 Basecbs 13335 ↾s cress 13336 .rcmulr 13415 Rngcrng 14214 SubRngcsubrng 14488 |
| 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 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4247 ax-pow 4309 ax-pr 4344 ax-un 4576 ax-setind 4682 ax-cnex 8264 ax-resscn 8265 ax-1cn 8266 ax-1re 8267 ax-icn 8268 ax-addcl 8269 ax-addrcl 8270 ax-mulcl 8271 ax-addcom 8273 ax-addass 8275 ax-i2m1 8278 ax-0lt1 8279 ax-0id 8281 ax-rnegex 8282 ax-pre-ltirr 8285 ax-pre-lttrn 8287 ax-pre-ltadd 8289 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-int 3969 df-br 4129 df-opab 4191 df-mpt 4192 df-id 4436 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-rn 4783 df-res 4784 df-ima 4785 df-iota 5335 df-fun 5377 df-fn 5378 df-fv 5383 df-ov 6082 df-oprab 6083 df-mpo 6084 df-pnf 8356 df-mnf 8357 df-ltxr 8359 df-inn 9288 df-2 9346 df-3 9347 df-ndx 13338 df-slot 13339 df-base 13341 df-sets 13342 df-iress 13343 df-plusg 13427 df-mulr 13428 df-mgm 13659 df-sgrp 13700 df-subg 13956 df-abl 14073 df-mgp 14201 df-rng 14215 df-subrng 14489 |
| This theorem is referenced by: issubrng2 14501 subrngintm 14503 |
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