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Theorem subrngmcl 14519
Description: A subgroup is closed under multiplication. (Contributed by Mario Carneiro, 2-Dec-2014.) Generalization of subrgmcl 14543. (Revised by AV, 14-Feb-2025.)
Hypothesis
Ref Expression
subrngmcl.p · = (.r𝑅)
Assertion
Ref Expression
subrngmcl ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → (𝑋 · 𝑌) ∈ 𝐴)

Proof of Theorem subrngmcl
StepHypRef Expression
1 eqid 2238 . . . . 5 (𝑅s 𝐴) = (𝑅s 𝐴)
21subrngrng 14512 . . . 4 (𝐴 ∈ (SubRng‘𝑅) → (𝑅s 𝐴) ∈ Rng)
323ad2ant1 1049 . . 3 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → (𝑅s 𝐴) ∈ Rng)
4 simp2 1029 . . . 4 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → 𝑋𝐴)
51subrngbas 14516 . . . . 5 (𝐴 ∈ (SubRng‘𝑅) → 𝐴 = (Base‘(𝑅s 𝐴)))
653ad2ant1 1049 . . . 4 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → 𝐴 = (Base‘(𝑅s 𝐴)))
74, 6eleqtrd 2317 . . 3 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → 𝑋 ∈ (Base‘(𝑅s 𝐴)))
8 simp3 1030 . . . 4 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → 𝑌𝐴)
98, 6eleqtrd 2317 . . 3 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → 𝑌 ∈ (Base‘(𝑅s 𝐴)))
10 eqid 2238 . . . 4 (Base‘(𝑅s 𝐴)) = (Base‘(𝑅s 𝐴))
11 eqid 2238 . . . 4 (.r‘(𝑅s 𝐴)) = (.r‘(𝑅s 𝐴))
1210, 11rngcl 14245 . . 3 (((𝑅s 𝐴) ∈ Rng ∧ 𝑋 ∈ (Base‘(𝑅s 𝐴)) ∧ 𝑌 ∈ (Base‘(𝑅s 𝐴))) → (𝑋(.r‘(𝑅s 𝐴))𝑌) ∈ (Base‘(𝑅s 𝐴)))
133, 7, 9, 12syl3anc 1278 . 2 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → (𝑋(.r‘(𝑅s 𝐴))𝑌) ∈ (Base‘(𝑅s 𝐴)))
14 subrngrcl 14513 . . . . 5 (𝐴 ∈ (SubRng‘𝑅) → 𝑅 ∈ Rng)
15 subrngmcl.p . . . . . 6 · = (.r𝑅)
161, 15ressmulrg 13501 . . . . 5 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑅 ∈ Rng) → · = (.r‘(𝑅s 𝐴)))
1714, 16mpdan 425 . . . 4 (𝐴 ∈ (SubRng‘𝑅) → · = (.r‘(𝑅s 𝐴)))
18173ad2ant1 1049 . . 3 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → · = (.r‘(𝑅s 𝐴)))
1918oveqd 6102 . 2 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → (𝑋 · 𝑌) = (𝑋(.r‘(𝑅s 𝐴))𝑌))
2013, 19, 63eltr4d 2322 1 ((𝐴 ∈ (SubRng‘𝑅) ∧ 𝑋𝐴𝑌𝐴) → (𝑋 · 𝑌) ∈ 𝐴)
Colors of variables:    wff set class
This proof depends on syntax axioms:  wi 4  w3a 1009   = wceq 1402  wcel 2209  cfv 5377  (class class class)co 6085  Basecbs 13354  s cress 13355  .rcmulr 13434  Rngcrng 14233  SubRngcsubrng 14507
This proof depends on 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 4249  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-icn 8274  ax-addcl 8275  ax-addrcl 8276  ax-mulcl 8277  ax-addcom 8279  ax-addass 8281  ax-i2m1 8284  ax-0lt1 8285  ax-0id 8287  ax-rnegex 8288  ax-pre-ltirr 8291  ax-pre-lttrn 8293  ax-pre-ltadd 8295
This proof 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 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-fv 5385  df-ov 6088  df-oprab 6089  df-mpo 6090  df-pnf 8362  df-mnf 8363  df-ltxr 8365  df-inn 9306  df-2 9364  df-3 9365  df-ndx 13357  df-slot 13358  df-base 13360  df-sets 13361  df-iress 13362  df-plusg 13446  df-mulr 13447  df-mgm 13678  df-sgrp 13719  df-subg 13975  df-abl 14092  df-mgp 14220  df-rng 14234  df-subrng 14508
This theorem is used by:  issubrng2  14520  subrngintm  14522
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