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| Mirrors > Home > ILE Home > Th. List > subrgin | GIF version | ||
| Description: The intersection of two subrings is a subring. (Contributed by Stefan O'Rear, 30-Nov-2014.) (Revised by Mario Carneiro, 7-Dec-2014.) |
| Ref | Expression |
|---|---|
| subrgin | ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → (𝐴 ∩ 𝐵) ∈ (SubRing‘𝑅)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | intprg 3956 | . 2 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) | |
| 2 | prssi 3826 | . . 3 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → {𝐴, 𝐵} ⊆ (SubRing‘𝑅)) | |
| 3 | prmg 3789 | . . . 4 ⊢ (𝐴 ∈ (SubRing‘𝑅) → ∃𝑤 𝑤 ∈ {𝐴, 𝐵}) | |
| 4 | 3 | adantr 276 | . . 3 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → ∃𝑤 𝑤 ∈ {𝐴, 𝐵}) |
| 5 | subrgintm 14228 | . . 3 ⊢ (({𝐴, 𝐵} ⊆ (SubRing‘𝑅) ∧ ∃𝑤 𝑤 ∈ {𝐴, 𝐵}) → ∩ {𝐴, 𝐵} ∈ (SubRing‘𝑅)) | |
| 6 | 2, 4, 5 | syl2anc 411 | . 2 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → ∩ {𝐴, 𝐵} ∈ (SubRing‘𝑅)) |
| 7 | 1, 6 | eqeltrrd 2307 | 1 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → (𝐴 ∩ 𝐵) ∈ (SubRing‘𝑅)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∃wex 1538 ∈ wcel 2200 ∩ cin 3196 ⊆ wss 3197 {cpr 3667 ∩ cint 3923 ‘cfv 5321 SubRingcsubrg 14202 |
| 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-in1 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-coll 4199 ax-sep 4202 ax-pow 4259 ax-pr 4294 ax-un 4525 ax-setind 4630 ax-cnex 8106 ax-resscn 8107 ax-1cn 8108 ax-1re 8109 ax-icn 8110 ax-addcl 8111 ax-addrcl 8112 ax-mulcl 8113 ax-addcom 8115 ax-addass 8117 ax-i2m1 8120 ax-0lt1 8121 ax-0id 8123 ax-rnegex 8124 ax-pre-ltirr 8127 ax-pre-lttrn 8129 ax-pre-ltadd 8131 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-reu 2515 df-rmo 2516 df-rab 2517 df-v 2801 df-sbc 3029 df-csb 3125 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-nul 3492 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-int 3924 df-iun 3967 df-br 4084 df-opab 4146 df-mpt 4147 df-id 4385 df-xp 4726 df-rel 4727 df-cnv 4728 df-co 4729 df-dm 4730 df-rn 4731 df-res 4732 df-ima 4733 df-iota 5281 df-fun 5323 df-fn 5324 df-f 5325 df-f1 5326 df-fo 5327 df-f1o 5328 df-fv 5329 df-riota 5963 df-ov 6013 df-oprab 6014 df-mpo 6015 df-pnf 8199 df-mnf 8200 df-ltxr 8202 df-inn 9127 df-2 9185 df-3 9186 df-ndx 13056 df-slot 13057 df-base 13059 df-sets 13060 df-iress 13061 df-plusg 13144 df-mulr 13145 df-0g 13312 df-mgm 13410 df-sgrp 13456 df-mnd 13471 df-grp 13557 df-minusg 13558 df-subg 13728 df-cmn 13844 df-abl 13845 df-mgp 13905 df-ur 13944 df-srg 13948 df-ring 13982 df-subrg 14204 |
| This theorem is referenced by: (None) |
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