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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 3962 | . 2 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → ∩ {𝐴, 𝐵} = (𝐴 ∩ 𝐵)) | |
| 2 | prssi 3832 | . . 3 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → {𝐴, 𝐵} ⊆ (SubRing‘𝑅)) | |
| 3 | prmg 3795 | . . . 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 14281 | . . 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 2308 | 1 ⊢ ((𝐴 ∈ (SubRing‘𝑅) ∧ 𝐵 ∈ (SubRing‘𝑅)) → (𝐴 ∩ 𝐵) ∈ (SubRing‘𝑅)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∃wex 1540 ∈ wcel 2201 ∩ cin 3198 ⊆ wss 3199 {cpr 3671 ∩ cint 3929 ‘cfv 5328 SubRingcsubrg 14255 |
| 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2203 ax-14 2204 ax-ext 2212 ax-coll 4205 ax-sep 4208 ax-pow 4266 ax-pr 4301 ax-un 4532 ax-setind 4637 ax-cnex 8128 ax-resscn 8129 ax-1cn 8130 ax-1re 8131 ax-icn 8132 ax-addcl 8133 ax-addrcl 8134 ax-mulcl 8135 ax-addcom 8137 ax-addass 8139 ax-i2m1 8142 ax-0lt1 8143 ax-0id 8145 ax-rnegex 8146 ax-pre-ltirr 8149 ax-pre-lttrn 8151 ax-pre-ltadd 8153 |
| This theorem depends on definitions: df-bi 117 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1810 df-eu 2081 df-mo 2082 df-clab 2217 df-cleq 2223 df-clel 2226 df-nfc 2362 df-ne 2402 df-nel 2497 df-ral 2514 df-rex 2515 df-reu 2516 df-rmo 2517 df-rab 2518 df-v 2803 df-sbc 3031 df-csb 3127 df-dif 3201 df-un 3203 df-in 3205 df-ss 3212 df-nul 3494 df-pw 3655 df-sn 3676 df-pr 3677 df-op 3679 df-uni 3895 df-int 3930 df-iun 3973 df-br 4090 df-opab 4152 df-mpt 4153 df-id 4392 df-xp 4733 df-rel 4734 df-cnv 4735 df-co 4736 df-dm 4737 df-rn 4738 df-res 4739 df-ima 4740 df-iota 5288 df-fun 5330 df-fn 5331 df-f 5332 df-f1 5333 df-fo 5334 df-f1o 5335 df-fv 5336 df-riota 5976 df-ov 6026 df-oprab 6027 df-mpo 6028 df-pnf 8221 df-mnf 8222 df-ltxr 8224 df-inn 9149 df-2 9207 df-3 9208 df-ndx 13108 df-slot 13109 df-base 13111 df-sets 13112 df-iress 13113 df-plusg 13196 df-mulr 13197 df-0g 13364 df-mgm 13462 df-sgrp 13508 df-mnd 13523 df-grp 13609 df-minusg 13610 df-subg 13780 df-cmn 13896 df-abl 13897 df-mgp 13958 df-ur 13997 df-srg 14001 df-ring 14035 df-subrg 14257 |
| This theorem is referenced by: (None) |
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