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Theorem ismgmn0 18818
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 2853 . . . 4 (𝐴 ∈ 𝐵 ↔ 𝐴 ∈ (Base‘𝑀))
32biimpi 219 . . 3 (𝐴 ∈ 𝐵 → 𝐴 ∈ (Base‘𝑀))
43elfvexd 6921 . 2 (𝐴 ∈ 𝐵 → 𝑀 ∈ V)
5 ismgmn0.o . . 3 ⚬ = (+g‘𝑀)
61, 5ismgm 18817 . 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 1570   ∈ wcel 2145  ∀wral 3077  Vcvv 3451  ‘cfv 6538  (class class class)co 7420  Basecbs 17387  +gcplusg 17428  Mgmcmgm 18814
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-nul 5260  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  df-ral 3078  df-rab 3414  df-v 3453  df-sbc 3740  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-dm 5661  df-iota 6494  df-fv 6546  df-ov 7423  df-mgm 18816
This theorem is used by:  mgmpropd  18829  mgm1  18836  opifismgm  18837  issgrpn0  18911  degenmgm  19137  degenmgm2  19140  xrsmgm  21713  opmpoismgm  49263  nnsgrpmgm  49272  2zrngamgm  49341  2zrngmmgm  49348
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