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Mirrors > Home > MPE Home > Th. List > Mathboxes > subofld | Structured version Visualization version GIF version |
Description: Every subfield of an ordered field is also an ordered field. (Contributed by Thierry Arnoux, 21-Jan-2018.) |
Ref | Expression |
---|---|
subofld | ⊢ ((𝐹 ∈ oField ∧ (𝐹 ↾s 𝐴) ∈ Field) → (𝐹 ↾s 𝐴) ∈ oField) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 485 | . 2 ⊢ ((𝐹 ∈ oField ∧ (𝐹 ↾s 𝐴) ∈ Field) → (𝐹 ↾s 𝐴) ∈ Field) | |
2 | isofld 32415 | . . . . 5 ⊢ (𝐹 ∈ oField ↔ (𝐹 ∈ Field ∧ 𝐹 ∈ oRing)) | |
3 | 2 | simprbi 497 | . . . 4 ⊢ (𝐹 ∈ oField → 𝐹 ∈ oRing) |
4 | 3 | adantr 481 | . . 3 ⊢ ((𝐹 ∈ oField ∧ (𝐹 ↾s 𝐴) ∈ Field) → 𝐹 ∈ oRing) |
5 | isfld 20367 | . . . . 5 ⊢ ((𝐹 ↾s 𝐴) ∈ Field ↔ ((𝐹 ↾s 𝐴) ∈ DivRing ∧ (𝐹 ↾s 𝐴) ∈ CRing)) | |
6 | 5 | simprbi 497 | . . . 4 ⊢ ((𝐹 ↾s 𝐴) ∈ Field → (𝐹 ↾s 𝐴) ∈ CRing) |
7 | crngring 20067 | . . . 4 ⊢ ((𝐹 ↾s 𝐴) ∈ CRing → (𝐹 ↾s 𝐴) ∈ Ring) | |
8 | 1, 6, 7 | 3syl 18 | . . 3 ⊢ ((𝐹 ∈ oField ∧ (𝐹 ↾s 𝐴) ∈ Field) → (𝐹 ↾s 𝐴) ∈ Ring) |
9 | suborng 32428 | . . 3 ⊢ ((𝐹 ∈ oRing ∧ (𝐹 ↾s 𝐴) ∈ Ring) → (𝐹 ↾s 𝐴) ∈ oRing) | |
10 | 4, 8, 9 | syl2anc 584 | . 2 ⊢ ((𝐹 ∈ oField ∧ (𝐹 ↾s 𝐴) ∈ Field) → (𝐹 ↾s 𝐴) ∈ oRing) |
11 | isofld 32415 | . 2 ⊢ ((𝐹 ↾s 𝐴) ∈ oField ↔ ((𝐹 ↾s 𝐴) ∈ Field ∧ (𝐹 ↾s 𝐴) ∈ oRing)) | |
12 | 1, 10, 11 | sylanbrc 583 | 1 ⊢ ((𝐹 ∈ oField ∧ (𝐹 ↾s 𝐴) ∈ Field) → (𝐹 ↾s 𝐴) ∈ oField) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 396 ∈ wcel 2106 (class class class)co 7408 ↾s cress 17172 Ringcrg 20055 CRingccrg 20056 DivRingcdr 20356 Fieldcfield 20357 oRingcorng 32408 oFieldcofld 32409 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7724 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-op 4635 df-uni 4909 df-iun 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-riota 7364 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7855 df-2nd 7975 df-frecs 8265 df-wrecs 8296 df-recs 8370 df-rdg 8409 df-er 8702 df-en 8939 df-dom 8940 df-sdom 8941 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-nn 12212 df-2 12274 df-3 12275 df-4 12276 df-5 12277 df-6 12278 df-7 12279 df-8 12280 df-9 12281 df-dec 12677 df-sets 17096 df-slot 17114 df-ndx 17126 df-base 17144 df-ress 17173 df-plusg 17209 df-mulr 17210 df-ple 17216 df-0g 17386 df-poset 18265 df-toset 18369 df-mgm 18560 df-sgrp 18609 df-mnd 18625 df-grp 18821 df-subg 19002 df-mgp 19987 df-ur 20004 df-ring 20057 df-cring 20058 df-field 20359 df-omnd 32212 df-ogrp 32213 df-orng 32410 df-ofld 32411 |
This theorem is referenced by: (None) |
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