| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 2238 | . . . 4 ⊢ (Base‘𝑅) = (Base‘𝑅) | |
| 2 | subrg1cl.a | . . . 4 ⊢ 1 = (1r‘𝑅) | |
| 3 | 1, 2 | issubrg 14529 | . . 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 |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 = wceq 1402 ∈ wcel 2209 ⊆ wss 3220 ‘cfv 5377 (class class class)co 6085 Basecbs 13352 ↾s cress 13353 1rcur 14262 Ringcrg 14300 SubRingcsubrg 14525 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-cnex 8270 ax-resscn 8271 ax-1re 8273 ax-addrcl 8276 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-int 3971 df-br 4131 df-opab 4193 df-mpt 4194 df-id 4438 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-rn 4785 df-res 4786 df-ima 4787 df-iota 5337 df-fun 5379 df-fn 5380 df-fv 5385 df-ov 6088 df-inn 9305 df-ndx 13355 df-slot 13356 df-base 13358 df-subrg 14527 |
| This theorem is used by: subrg1 14539 subrgsubm 14542 issubrg2 14549 subrgintm 14551 subsubrg 14553 zsssubrg 14922 issubassa2 15035 |
| Copyright terms: Public domain | W3C validator |