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Mirrors > Home > MPE Home > Th. List > Mathboxes > 0mgm | Structured version Visualization version GIF version |
Description: A set with an empty base set is always a magma". (Contributed by AV, 25-Feb-2020.) |
Ref | Expression |
---|---|
0mgm.b | ⊢ (Base‘𝑀) = ∅ |
Ref | Expression |
---|---|
0mgm | ⊢ (𝑀 ∈ 𝑉 → 𝑀 ∈ Mgm) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ral0 4028 | . 2 ⊢ ∀𝑥 ∈ ∅ ∀𝑦 ∈ ∅ (𝑥(+g‘𝑀)𝑦) ∈ ∅ | |
2 | 0mgm.b | . . . 4 ⊢ (Base‘𝑀) = ∅ | |
3 | 2 | eqcomi 2619 | . . 3 ⊢ ∅ = (Base‘𝑀) |
4 | eqid 2610 | . . 3 ⊢ (+g‘𝑀) = (+g‘𝑀) | |
5 | 3, 4 | ismgm 17066 | . 2 ⊢ (𝑀 ∈ 𝑉 → (𝑀 ∈ Mgm ↔ ∀𝑥 ∈ ∅ ∀𝑦 ∈ ∅ (𝑥(+g‘𝑀)𝑦) ∈ ∅)) |
6 | 1, 5 | mpbiri 247 | 1 ⊢ (𝑀 ∈ 𝑉 → 𝑀 ∈ Mgm) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1475 ∈ wcel 1977 ∀wral 2896 ∅c0 3874 ‘cfv 5804 (class class class)co 6549 Basecbs 15695 +gcplusg 15768 Mgmcmgm 17063 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-nul 4717 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-iota 5768 df-fv 5812 df-ov 6552 df-mgm 17065 |
This theorem is referenced by: (None) |
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