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Mirrors > Home > MPE Home > Th. List > ringcl | Structured version Visualization version GIF version |
Description: Closure of the multiplication operation of a ring. (Contributed by NM, 26-Aug-2011.) (Revised by Mario Carneiro, 6-Jan-2015.) |
Ref | Expression |
---|---|
ringcl.b | ⊢ 𝐵 = (Base‘𝑅) |
ringcl.t | ⊢ · = (.r‘𝑅) |
Ref | Expression |
---|---|
ringcl | ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 · 𝑌) ∈ 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqid 2738 | . . 3 ⊢ (mulGrp‘𝑅) = (mulGrp‘𝑅) | |
2 | 1 | ringmgp 19704 | . 2 ⊢ (𝑅 ∈ Ring → (mulGrp‘𝑅) ∈ Mnd) |
3 | ringcl.b | . . . 4 ⊢ 𝐵 = (Base‘𝑅) | |
4 | 1, 3 | mgpbas 19641 | . . 3 ⊢ 𝐵 = (Base‘(mulGrp‘𝑅)) |
5 | ringcl.t | . . . 4 ⊢ · = (.r‘𝑅) | |
6 | 1, 5 | mgpplusg 19639 | . . 3 ⊢ · = (+g‘(mulGrp‘𝑅)) |
7 | 4, 6 | mndcl 18308 | . 2 ⊢ (((mulGrp‘𝑅) ∈ Mnd ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 · 𝑌) ∈ 𝐵) |
8 | 2, 7 | syl3an1 1161 | 1 ⊢ ((𝑅 ∈ Ring ∧ 𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝐵) → (𝑋 · 𝑌) ∈ 𝐵) |
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