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Theorem mgmsscl 13004
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 6063 . . 3 ((𝑋𝑆𝑌𝑆) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐺)𝑌))
213ad2ant3 1022 . 2 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐺)𝑌))
3 simp1r 1024 . . . . 5 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → 𝐻 ∈ Mgm)
4 simp3 1001 . . . . 5 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋𝑆𝑌𝑆))
5 3anass 984 . . . . 5 ((𝐻 ∈ Mgm ∧ 𝑋𝑆𝑌𝑆) ↔ (𝐻 ∈ Mgm ∧ (𝑋𝑆𝑌𝑆)))
63, 4, 5sylanbrc 417 . . . 4 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝐻 ∈ Mgm ∧ 𝑋𝑆𝑌𝑆))
7 mgmsscl.s . . . . 5 𝑆 = (Base‘𝐻)
8 eqid 2196 . . . . 5 (+g𝐻) = (+g𝐻)
97, 8mgmcl 13002 . . . 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 5928 . . . . . . 7 (((+g𝐺) ↾ (𝑆 × 𝑆)) = (+g𝐻) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐻)𝑌))
1211eleq1d 2265 . . . . . 6 (((+g𝐺) ↾ (𝑆 × 𝑆)) = (+g𝐻) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
1312eqcoms 2199 . . . . 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 1021 . . 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 2274 1 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋(+g𝐺)𝑌) ∈ 𝑆)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105  w3a 980   = wceq 1364  wcel 2167  wss 3157   × cxp 4661  cres 4665  cfv 5258  (class class class)co 5922  Basecbs 12678  +gcplusg 12755  Mgmcmgm 12997
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-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 4151  ax-pow 4207  ax-pr 4242  ax-un 4468  ax-cnex 7970  ax-resscn 7971  ax-1re 7973  ax-addrcl 7976
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  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-ral 2480  df-rex 2481  df-v 2765  df-sbc 2990  df-un 3161  df-in 3163  df-ss 3170  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-int 3875  df-br 4034  df-opab 4095  df-mpt 4096  df-id 4328  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-rn 4674  df-res 4675  df-iota 5219  df-fun 5260  df-fn 5261  df-fv 5266  df-ov 5925  df-inn 8991  df-2 9049  df-ndx 12681  df-slot 12682  df-base 12684  df-plusg 12768  df-mgm 12999
This theorem is referenced by:  mndissubm  13107  grpissubg  13324
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