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Theorem ismgmn0 18827
Description: The predicate "is a magma" for a structure with a nonempty base set. (Contributed by AV, 29-Jan-2020.)
Hypotheses
Ref Expression
ismgmn0.b 𝐵 = (Base‘𝑀)
ismgmn0.o ⚬ = (+g‘𝑀)
Assertion
Ref Expression
ismgmn0 (𝐴 ∈ 𝐵 → (𝑀 ∈ Mgm ↔ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥 ⚬ 𝑦) ∈ 𝐵))
Distinct variable groups:   𝑥,𝐵,𝑦   𝑥,𝑀,𝑦   𝑥, ⚬ ,𝑦
Allowed substitution hints:   𝐴(𝑥, 𝑦)

Proof of Theorem ismgmn0
StepHypRef Expression
1 ismgmn0.b . . . . 5 𝐵 = (Base‘𝑀)
21eleq2i 2852 . . . 4 (𝐴 ∈ 𝐵 ↔ 𝐴 ∈ (Base‘𝑀))
32biimpi 219 . . 3 (𝐴 ∈ 𝐵 → 𝐴 ∈ (Base‘𝑀))
43elfvexd 6926 . 2 (𝐴 ∈ 𝐵 → 𝑀 ∈ V)
5 ismgmn0.o . . 3 ⚬ = (+g‘𝑀)
61, 5ismgm 18826 . 2 (𝑀 ∈ V → (𝑀 ∈ Mgm ↔ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥 ⚬ 𝑦) ∈ 𝐵))
74, 6syl 18 1 (𝐴 ∈ 𝐵 → (𝑀 ∈ Mgm ↔ ∀𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 (𝑥 ⚬ 𝑦) ∈ 𝐵))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   = wceq 1569   ∈ wcel 2144  ∀wral 3076  Vcvv 3450  ‘cfv 6543  (class class class)co 7424  Basecbs 17396  +gcplusg 17437  Mgmcmgm 18823
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-nul 5259  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-ne 2956  df-ral 3077  df-rab 3413  df-v 3452  df-sbc 3739  df-ss 3897  df-dif 4046  df-un 4150  df-nul 4278  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-br 5103  df-dm 5661  df-iota 6497  df-fv 6551  df-ov 7427  df-mgm 18825
This theorem is used by:  mgmpropd  18838  mgm1  18845  opifismgm  18846  issgrpn0  18920  degenmgm  19146  degenmgm2  19149  xrsmgm  21722  opmpoismgm  49400  nnsgrpmgm  49409  2zrngamgm  49478  2zrngmmgm  49485
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