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Mirrors > Home > MPE Home > Th. List > Mathboxes > extdgid | Structured version Visualization version GIF version |
Description: A trivial field extension has degree one. (Contributed by Thierry Arnoux, 4-Aug-2023.) |
Ref | Expression |
---|---|
extdgid | ⊢ (𝐸 ∈ Field → (𝐸[:]𝐸) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fldextid 33650 | . . 3 ⊢ (𝐸 ∈ Field → 𝐸/FldExt𝐸) | |
2 | extdgval 33645 | . . 3 ⊢ (𝐸/FldExt𝐸 → (𝐸[:]𝐸) = (dim‘((subringAlg ‘𝐸)‘(Base‘𝐸)))) | |
3 | 1, 2 | syl 17 | . 2 ⊢ (𝐸 ∈ Field → (𝐸[:]𝐸) = (dim‘((subringAlg ‘𝐸)‘(Base‘𝐸)))) |
4 | isfld 20738 | . . . 4 ⊢ (𝐸 ∈ Field ↔ (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) | |
5 | 4 | simplbi 497 | . . 3 ⊢ (𝐸 ∈ Field → 𝐸 ∈ DivRing) |
6 | rlmval 21197 | . . . . 5 ⊢ (ringLMod‘𝐸) = ((subringAlg ‘𝐸)‘(Base‘𝐸)) | |
7 | 6 | eqcomi 2742 | . . . 4 ⊢ ((subringAlg ‘𝐸)‘(Base‘𝐸)) = (ringLMod‘𝐸) |
8 | 7 | rlmdim 33600 | . . 3 ⊢ (𝐸 ∈ DivRing → (dim‘((subringAlg ‘𝐸)‘(Base‘𝐸))) = 1) |
9 | 5, 8 | syl 17 | . 2 ⊢ (𝐸 ∈ Field → (dim‘((subringAlg ‘𝐸)‘(Base‘𝐸))) = 1) |
10 | 3, 9 | eqtrd 2773 | 1 ⊢ (𝐸 ∈ Field → (𝐸[:]𝐸) = 1) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1535 ∈ wcel 2104 class class class wbr 5149 ‘cfv 6558 (class class class)co 7425 1c1 11147 Basecbs 17234 CRingccrg 20237 DivRingcdr 20727 Fieldcfield 20728 subringAlg csra 21169 ringLModcrglmod 21170 dimcldim 33589 /FldExtcfldext 33629 [:]cextdg 33632 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1963 ax-7 2003 ax-8 2106 ax-9 2114 ax-10 2137 ax-11 2153 ax-12 2173 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5366 ax-pr 5430 ax-un 7747 ax-reg 9623 ax-inf2 9672 ax-ac2 10494 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1538 df-fal 1548 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2536 df-eu 2565 df-clab 2711 df-cleq 2725 df-clel 2812 df-nfc 2888 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3479 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4915 df-int 4954 df-iun 5000 df-iin 5001 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5576 df-eprel 5582 df-po 5590 df-so 5591 df-fr 5635 df-se 5636 df-we 5637 df-xp 5689 df-rel 5690 df-cnv 5691 df-co 5692 df-dm 5693 df-rn 5694 df-res 5695 df-ima 5696 df-pred 6317 df-ord 6383 df-on 6384 df-lim 6385 df-suc 6386 df-iota 6510 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-fv 6566 df-isom 6567 df-riota 7381 df-ov 7428 df-oprab 7429 df-mpo 7430 df-om 7881 df-1st 8007 df-2nd 8008 df-tpos 8244 df-frecs 8299 df-wrecs 8330 df-recs 8404 df-rdg 8443 df-1o 8499 df-2o 8500 df-er 8738 df-map 8861 df-en 8979 df-dom 8980 df-sdom 8981 df-fin 8982 df-oi 9541 df-r1 9795 df-rank 9796 df-card 9970 df-acn 9973 df-ac 10147 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11485 df-neg 11486 df-nn 12258 df-2 12320 df-3 12321 df-4 12322 df-5 12323 df-6 12324 df-7 12325 df-8 12326 df-9 12327 df-n0 12518 df-xnn0 12591 df-z 12605 df-dec 12725 df-uz 12870 df-fz 13538 df-hash 14356 df-struct 17170 df-sets 17187 df-slot 17205 df-ndx 17217 df-base 17235 df-ress 17264 df-plusg 17300 df-mulr 17301 df-sca 17303 df-vsca 17304 df-ip 17305 df-tset 17306 df-ple 17307 df-ocomp 17308 df-0g 17477 df-mre 17620 df-mrc 17621 df-mri 17622 df-acs 17623 df-proset 18341 df-drs 18342 df-poset 18359 df-ipo 18574 df-mgm 18654 df-sgrp 18733 df-mnd 18749 df-submnd 18795 df-grp 18952 df-minusg 18953 df-sbg 18954 df-subg 19139 df-cmn 19800 df-abl 19801 df-mgp 20138 df-rng 20156 df-ur 20185 df-ring 20238 df-oppr 20336 df-dvdsr 20359 df-unit 20360 df-invr 20390 df-subrg 20573 df-drng 20729 df-field 20730 df-lmod 20858 df-lss 20929 df-lsp 20969 df-lbs 21073 df-lvec 21101 df-sra 21171 df-rgmod 21172 df-lidl 21217 df-rsp 21218 df-lindf 21825 df-linds 21826 df-dim 33590 df-fldext 33633 df-extdg 33634 |
This theorem is referenced by: extdg1b 33655 fldext2chn 33697 |
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