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Theorem mgmsscl 12615
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 5992 . . 3 ((𝑋𝑆𝑌𝑆) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐺)𝑌))
213ad2ant3 1015 . 2 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐺)𝑌))
3 simp1r 1017 . . . . 5 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → 𝐻 ∈ Mgm)
4 simp3 994 . . . . 5 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋𝑆𝑌𝑆))
5 3anass 977 . . . . 5 ((𝐻 ∈ Mgm ∧ 𝑋𝑆𝑌𝑆) ↔ (𝐻 ∈ Mgm ∧ (𝑋𝑆𝑌𝑆)))
63, 4, 5sylanbrc 415 . . . 4 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝐻 ∈ Mgm ∧ 𝑋𝑆𝑌𝑆))
7 mgmsscl.s . . . . 5 𝑆 = (Base‘𝐻)
8 eqid 2170 . . . . 5 (+g𝐻) = (+g𝐻)
97, 8mgmcl 12613 . . . 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 5859 . . . . . . 7 (((+g𝐺) ↾ (𝑆 × 𝑆)) = (+g𝐻) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) = (𝑋(+g𝐻)𝑌))
1211eleq1d 2239 . . . . . 6 (((+g𝐺) ↾ (𝑆 × 𝑆)) = (+g𝐻) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
1312eqcoms 2173 . . . . 5 ((+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆)) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
1413adantl 275 . . . 4 ((𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
15143ad2ant2 1014 . . 3 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → ((𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆 ↔ (𝑋(+g𝐻)𝑌) ∈ 𝑆))
1610, 15mpbird 166 . 2 (((𝐺 ∈ Mgm ∧ 𝐻 ∈ Mgm) ∧ (𝑆𝐵 ∧ (+g𝐻) = ((+g𝐺) ↾ (𝑆 × 𝑆))) ∧ (𝑋𝑆𝑌𝑆)) → (𝑋((+g𝐺) ↾ (𝑆 × 𝑆))𝑌) ∈ 𝑆)
172, 16eqeltrrd 2248 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 103  wb 104  w3a 973   = wceq 1348  wcel 2141  wss 3121   × cxp 4609  cres 4613  cfv 5198  (class class class)co 5853  Basecbs 12416  +gcplusg 12480  Mgmcmgm 12608
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-cnex 7865  ax-resscn 7866  ax-1re 7868  ax-addrcl 7871
This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-v 2732  df-sbc 2956  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-br 3990  df-opab 4051  df-mpt 4052  df-id 4278  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-iota 5160  df-fun 5200  df-fn 5201  df-fv 5206  df-ov 5856  df-inn 8879  df-2 8937  df-ndx 12419  df-slot 12420  df-base 12422  df-plusg 12493  df-mgm 12610
This theorem is referenced by:  mndissubm  12697
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