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Theorem mgmsscl 13683
Description: If the base set of a magma is contained in the base set of another magma, and the group operation of the magma is the restriction of the group operation of the other magma to its base set, then the base set of the magma is closed under the group operation of the other magma. (Contributed by AV, 17-Feb-2024.)
Hypotheses
Ref Expression
mgmsscl.b 𝐵 = (Base‘𝐺)
mgmsscl.s 𝑆 = (Base‘𝐻)
Assertion
Ref Expression
mgmsscl (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋(+g𝐺)𝑌) ∈ 𝑆)

Proof of Theorem mgmsscl
StepHypRef Expression
1 ovres 6229 . . 3 ((𝑋𝑆𝑌𝑆) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐺)𝑌))
213ad2ant3 1051 . 2 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐺)𝑌))
3 simp1r 1053 . . . . 5 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → 𝐻 ∈ Mgm)
4 simp3 1030 . . . . 5 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋𝑆𝑌𝑆))
5 3anass 1013 . . . . 5 ((𝐻 ∈ Mgm ∧ 𝑋𝑆𝑌𝑆) ↔ (𝐻 ∈ Mgm ∧ (𝑋𝑆𝑌𝑆)))
63, 4, 5sylanbrc 421 . . . 4 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝐻 ∈ Mgm ∧ 𝑋𝑆𝑌𝑆))
7 mgmsscl.s . . . . 5 𝑆 = (Base‘𝐻)
8 eqid 2238 . . . . 5 (+g𝐻) = (+g𝐻)
97, 8mgmcl 13681 . . . 4 ((𝐻 ∈ Mgm ∧ 𝑋𝑆𝑌𝑆) → (𝑋(+g𝐻)𝑌) ∈ 𝑆)
106, 9syl 14 . . 3 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋(+g𝐻)𝑌) ∈ 𝑆)
11 oveq 6091 . . . . . . 7 (((+g𝐺) ↾ (𝑆 × 𝑆)) = (+g𝐻) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐻)𝑌))
1211eleq1d 2307 . . . . . 6 (((+g𝐺) ↾ (𝑆 × 𝑆)) = (+g𝐻) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
1312eqcoms 2241 . . . . 5 ((+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆)) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
1413adantl 277 . . . 4 ((𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
15143ad2ant2 1050 . . 3 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
1610, 15mpbird 167 . 2 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆)
172, 16eqeltrrd 2316 1 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋(+g𝐺)𝑌) ∈ 𝑆)
Colors of variables:    wff set class
This proof depends on syntax axioms:  wi 4  wa 104  wb 105  w3a 1009   = wceq 1402  wcel 2209  wss 3220   × cxp 4772  cres 4776  cfv 5377  (class class class)co 6085  Basecbs 13354  +gcplusg 13433  Mgmcmgm 13676
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  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-cnex 8270  ax-resscn 8271  ax-1re 8273  ax-addrcl 8276
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  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-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  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-iota 5337  df-fun 5379  df-fn 5380  df-fv 5385  df-ov 6088  df-inn 9306  df-2 9364  df-ndx 13357  df-slot 13358  df-base 13360  df-plusg 13446  df-mgm 13678
This theorem is used by:  mndissubm  13784  grpissubg  13999
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