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| Mirrors > Home > MPE Home > Th. List > Mathboxes > extdgcl | Structured version Visualization version GIF version | ||
| Description: Closure of the field extension degree operation. (Contributed by Thierry Arnoux, 29-Jul-2023.) |
| Ref | Expression |
|---|---|
| extdgcl | ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) ∈ ℕ0*) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | extdgval 33960 | . 2 ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) = (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) | |
| 2 | fldextfld1 33954 | . . . . . 6 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ Field) | |
| 3 | isfld 20815 | . . . . . 6 ⊢ (𝐸 ∈ Field ↔ (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) | |
| 4 | 2, 3 | sylib 221 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) |
| 5 | 4 | simpld 499 | . . . 4 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ DivRing) |
| 6 | fldextress 33958 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 = (𝐸 ↾s (Base‘𝐹))) | |
| 7 | fldextfld2 33955 | . . . . . . 7 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ Field) | |
| 8 | isfld 20815 | . . . . . . 7 ⊢ (𝐹 ∈ Field ↔ (𝐹 ∈ DivRing ∧ 𝐹 ∈ CRing)) | |
| 9 | 7, 8 | sylib 221 | . . . . . 6 ⊢ (𝐸/FldExt𝐹 → (𝐹 ∈ DivRing ∧ 𝐹 ∈ CRing)) |
| 10 | 9 | simpld 499 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ DivRing) |
| 11 | 6, 10 | eqeltrrd 2866 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (𝐸 ↾s (Base‘𝐹)) ∈ DivRing) |
| 12 | eqid 2765 | . . . . 5 ⊢ (Base‘𝐹) = (Base‘𝐹) | |
| 13 | 12 | fldextsubrg 33956 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (Base‘𝐹) ∈ (SubRing‘𝐸)) |
| 14 | eqid 2765 | . . . . 5 ⊢ ((subringAlg ‘𝐸)‘(Base‘𝐹)) = ((subringAlg ‘𝐸)‘(Base‘𝐹)) | |
| 15 | eqid 2765 | . . . . 5 ⊢ (𝐸 ↾s (Base‘𝐹)) = (𝐸 ↾s (Base‘𝐹)) | |
| 16 | 14, 15 | sralvec 33892 | . . . 4 ⊢ ((𝐸 ∈ DivRing ∧ (𝐸 ↾s (Base‘𝐹)) ∈ DivRing ∧ (Base‘𝐹) ∈ (SubRing‘𝐸)) → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 17 | 5, 11, 13, 16 | syl3anc 1394 | . . 3 ⊢ (𝐸/FldExt𝐹 → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 18 | dimcl 33910 | . . 3 ⊢ (((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec → (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹))) ∈ ℕ0*) | |
| 19 | 17, 18 | syl 18 | . 2 ⊢ (𝐸/FldExt𝐹 → (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹))) ∈ ℕ0*) |
| 20 | 1, 19 | eqeltrd 2865 | 1 ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) ∈ ℕ0*) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 400 ∈ wcel 2145 class class class wbr 5105 ‘cfv 6525 (class class class)co 7400 ℕ0*cxnn0 12568 Basecbs 17259 ↾s cress 17280 CRingccrg 20307 SubRingcsubrg 20645 DivRingcdr 20804 Fieldcfield 20805 LVecclvec 21192 subringAlg csra 21261 dimcldim 33906 /FldExtcfldext 33945 [:]cextdg 33947 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-rep 5232 ax-sep 5251 ax-nul 5261 ax-pow 5327 ax-pr 5395 ax-un 7722 ax-reg 9542 ax-inf2 9598 ax-ac2 10435 ax-cnex 11144 ax-resscn 11145 ax-1cn 11146 ax-icn 11147 ax-addcl 11148 ax-addrcl 11149 ax-mulcl 11150 ax-mulrcl 11151 ax-mulcom 11152 ax-addass 11153 ax-mulass 11154 ax-distr 11155 ax-i2m1 11156 ax-1ne0 11157 ax-1rid 11158 ax-rnegex 11159 ax-rrecex 11160 ax-cnre 11161 ax-pre-lttri 11162 ax-pre-lttrn 11163 ax-pre-ltadd 11164 ax-pre-mulgt0 11165 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3065 df-ral 3080 df-rex 3090 df-rmo 3370 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4869 df-int 4909 df-iun 4954 df-iin 4955 df-br 5106 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5547 df-eprel 5552 df-po 5560 df-so 5561 df-fr 5605 df-se 5606 df-we 5607 df-xp 5658 df-rel 5659 df-cnv 5660 df-co 5661 df-dm 5662 df-rn 5663 df-res 5664 df-ima 5665 df-pred 6292 df-ord 6353 df-on 6354 df-lim 6355 df-suc 6356 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-isom 6534 df-riota 7357 df-ov 7403 df-oprab 7404 df-mpo 7405 df-rpss 7710 df-om 7851 df-1st 7974 df-2nd 7975 df-tpos 8210 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-1o 8441 df-2o 8442 df-oadd 8445 df-er 8682 df-map 8814 df-en 8932 df-dom 8933 df-sdom 8934 df-fin 8935 df-oi 9460 df-r1 9724 df-rank 9725 df-dju 9875 df-card 9913 df-acn 9916 df-ac 10088 df-pnf 11233 df-mnf 11234 df-xr 11235 df-ltxr 11236 df-le 11237 df-sub 11431 df-neg 11432 df-nn 12225 df-2 12294 df-3 12295 df-4 12296 df-5 12297 df-6 12298 df-7 12299 df-8 12300 df-9 12301 df-n0 12496 df-xnn0 12569 df-z 12583 df-dec 12703 df-uz 12854 df-fz 13527 df-hash 14358 df-struct 17197 df-sets 17214 df-slot 17232 df-ndx 17244 df-base 17260 df-ress 17281 df-plusg 17313 df-mulr 17314 df-sca 17316 df-vsca 17317 df-ip 17318 df-tset 17319 df-ple 17320 df-ocomp 17321 df-0g 17484 df-mre 17628 df-mrc 17629 df-mri 17630 df-acs 17631 df-proset 18340 df-drs 18341 df-poset 18359 df-ipo 18574 df-mgm 18688 df-sgrp 18767 df-mnd 18783 df-submnd 18832 df-grp 18993 df-minusg 18994 df-sbg 18995 df-subg 19180 df-cmn 19843 df-abl 19844 df-mgp 20208 df-rng 20222 df-ur 20255 df-ring 20308 df-oppr 20410 df-dvdsr 20430 df-unit 20431 df-invr 20461 df-subrg 20646 df-drng 20806 df-field 20807 df-lmod 20952 df-lss 21022 df-lsp 21062 df-lbs 21165 df-lvec 21193 df-sra 21263 df-dim 33907 df-fldext 33948 df-extdg 33949 |
| This theorem is referenced by: finexttrb 33972 fldextrspundglemul 33986 fldextrspundgdvdslem 33987 fldextrspundgdvds 33988 rtelextdg2 34034 constrext2chnlem 34057 |
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