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| Mirrors > Home > ILE Home > Th. List > subrg1cl | GIF version | ||
| Description: A subring contains the multiplicative identity. (Contributed by Stefan O'Rear, 27-Nov-2014.) |
| Ref | Expression |
|---|---|
| subrg1cl.a | ⊢ 1 = (1r‘𝑅) |
| Ref | Expression |
|---|---|
| subrg1cl | ⊢ (𝐴 ∈ (SubRing‘𝑅) → 1 ∈ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid 2204 | . . . 4 ⊢ (Base‘𝑅) = (Base‘𝑅) | |
| 2 | subrg1cl.a | . . . 4 ⊢ 1 = (1r‘𝑅) | |
| 3 | 1, 2 | issubrg 13925 | . . 3 ⊢ (𝐴 ∈ (SubRing‘𝑅) ↔ ((𝑅 ∈ Ring ∧ (𝑅 ↾s 𝐴) ∈ Ring) ∧ (𝐴 ⊆ (Base‘𝑅) ∧ 1 ∈ 𝐴))) |
| 4 | 3 | simprbi 275 | . 2 ⊢ (𝐴 ∈ (SubRing‘𝑅) → (𝐴 ⊆ (Base‘𝑅) ∧ 1 ∈ 𝐴)) |
| 5 | 4 | simprd 114 | 1 ⊢ (𝐴 ∈ (SubRing‘𝑅) → 1 ∈ 𝐴) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 = wceq 1372 ∈ wcel 2175 ⊆ wss 3165 ‘cfv 5270 (class class class)co 5943 Basecbs 12774 ↾s cress 12775 1rcur 13663 Ringcrg 13700 SubRingcsubrg 13921 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 710 ax-5 1469 ax-7 1470 ax-gen 1471 ax-ie1 1515 ax-ie2 1516 ax-8 1526 ax-10 1527 ax-11 1528 ax-i12 1529 ax-bndl 1531 ax-4 1532 ax-17 1548 ax-i9 1552 ax-ial 1556 ax-i5r 1557 ax-13 2177 ax-14 2178 ax-ext 2186 ax-sep 4161 ax-pow 4217 ax-pr 4252 ax-un 4479 ax-cnex 8015 ax-resscn 8016 ax-1re 8018 ax-addrcl 8021 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1375 df-nf 1483 df-sb 1785 df-eu 2056 df-mo 2057 df-clab 2191 df-cleq 2197 df-clel 2200 df-nfc 2336 df-ral 2488 df-rex 2489 df-rab 2492 df-v 2773 df-sbc 2998 df-csb 3093 df-un 3169 df-in 3171 df-ss 3178 df-pw 3617 df-sn 3638 df-pr 3639 df-op 3641 df-uni 3850 df-int 3885 df-br 4044 df-opab 4105 df-mpt 4106 df-id 4339 df-xp 4680 df-rel 4681 df-cnv 4682 df-co 4683 df-dm 4684 df-rn 4685 df-res 4686 df-ima 4687 df-iota 5231 df-fun 5272 df-fn 5273 df-fv 5278 df-ov 5946 df-inn 9036 df-ndx 12777 df-slot 12778 df-base 12780 df-subrg 13923 |
| This theorem is referenced by: subrg1 13935 subrgsubm 13938 issubrg2 13945 subrgintm 13947 subsubrg 13949 zsssubrg 14289 |
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