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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 33677 | . 2 ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) = (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) | |
| 2 | fldextfld1 33671 | . . . . . 6 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ Field) | |
| 3 | isfld 20665 | . . . . . 6 ⊢ (𝐸 ∈ Field ↔ (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) | |
| 4 | 2, 3 | sylib 218 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) |
| 5 | 4 | simpld 494 | . . . 4 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ DivRing) |
| 6 | fldextress 33675 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 = (𝐸 ↾s (Base‘𝐹))) | |
| 7 | fldextfld2 33672 | . . . . . . 7 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ Field) | |
| 8 | isfld 20665 | . . . . . . 7 ⊢ (𝐹 ∈ Field ↔ (𝐹 ∈ DivRing ∧ 𝐹 ∈ CRing)) | |
| 9 | 7, 8 | sylib 218 | . . . . . 6 ⊢ (𝐸/FldExt𝐹 → (𝐹 ∈ DivRing ∧ 𝐹 ∈ CRing)) |
| 10 | 9 | simpld 494 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ DivRing) |
| 11 | 6, 10 | eqeltrrd 2834 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (𝐸 ↾s (Base‘𝐹)) ∈ DivRing) |
| 12 | eqid 2733 | . . . . 5 ⊢ (Base‘𝐹) = (Base‘𝐹) | |
| 13 | 12 | fldextsubrg 33673 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (Base‘𝐹) ∈ (SubRing‘𝐸)) |
| 14 | eqid 2733 | . . . . 5 ⊢ ((subringAlg ‘𝐸)‘(Base‘𝐹)) = ((subringAlg ‘𝐸)‘(Base‘𝐹)) | |
| 15 | eqid 2733 | . . . . 5 ⊢ (𝐸 ↾s (Base‘𝐹)) = (𝐸 ↾s (Base‘𝐹)) | |
| 16 | 14, 15 | sralvec 33608 | . . . 4 ⊢ ((𝐸 ∈ DivRing ∧ (𝐸 ↾s (Base‘𝐹)) ∈ DivRing ∧ (Base‘𝐹) ∈ (SubRing‘𝐸)) → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 17 | 5, 11, 13, 16 | syl3anc 1373 | . . 3 ⊢ (𝐸/FldExt𝐹 → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 18 | dimcl 33626 | . . 3 ⊢ (((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec → (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹))) ∈ ℕ0*) | |
| 19 | 17, 18 | syl 17 | . 2 ⊢ (𝐸/FldExt𝐹 → (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹))) ∈ ℕ0*) |
| 20 | 1, 19 | eqeltrd 2833 | 1 ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) ∈ ℕ0*) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2113 class class class wbr 5095 ‘cfv 6489 (class class class)co 7355 ℕ0*cxnn0 12464 Basecbs 17130 ↾s cress 17151 CRingccrg 20162 SubRingcsubrg 20494 DivRingcdr 20654 Fieldcfield 20655 LVecclvec 21046 subringAlg csra 21115 dimcldim 33622 /FldExtcfldext 33662 [:]cextdg 33664 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2705 ax-rep 5221 ax-sep 5238 ax-nul 5248 ax-pow 5307 ax-pr 5374 ax-un 7677 ax-reg 9488 ax-inf2 9541 ax-ac2 10364 ax-cnex 11072 ax-resscn 11073 ax-1cn 11074 ax-icn 11075 ax-addcl 11076 ax-addrcl 11077 ax-mulcl 11078 ax-mulrcl 11079 ax-mulcom 11080 ax-addass 11081 ax-mulass 11082 ax-distr 11083 ax-i2m1 11084 ax-1ne0 11085 ax-1rid 11086 ax-rnegex 11087 ax-rrecex 11088 ax-cnre 11089 ax-pre-lttri 11090 ax-pre-lttrn 11091 ax-pre-ltadd 11092 ax-pre-mulgt0 11093 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2725 df-clel 2808 df-nfc 2883 df-ne 2931 df-nel 3035 df-ral 3050 df-rex 3059 df-rmo 3348 df-reu 3349 df-rab 3398 df-v 3440 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4285 df-if 4477 df-pw 4553 df-sn 4578 df-pr 4580 df-op 4584 df-uni 4861 df-int 4900 df-iun 4945 df-iin 4946 df-br 5096 df-opab 5158 df-mpt 5177 df-tr 5203 df-id 5516 df-eprel 5521 df-po 5529 df-so 5530 df-fr 5574 df-se 5575 df-we 5576 df-xp 5627 df-rel 5628 df-cnv 5629 df-co 5630 df-dm 5631 df-rn 5632 df-res 5633 df-ima 5634 df-pred 6256 df-ord 6317 df-on 6318 df-lim 6319 df-suc 6320 df-iota 6445 df-fun 6491 df-fn 6492 df-f 6493 df-f1 6494 df-fo 6495 df-f1o 6496 df-fv 6497 df-isom 6498 df-riota 7312 df-ov 7358 df-oprab 7359 df-mpo 7360 df-rpss 7665 df-om 7806 df-1st 7930 df-2nd 7931 df-tpos 8165 df-frecs 8220 df-wrecs 8251 df-recs 8300 df-rdg 8338 df-1o 8394 df-2o 8395 df-oadd 8398 df-er 8631 df-map 8761 df-en 8879 df-dom 8880 df-sdom 8881 df-fin 8882 df-oi 9406 df-r1 9667 df-rank 9668 df-dju 9804 df-card 9842 df-acn 9845 df-ac 10017 df-pnf 11158 df-mnf 11159 df-xr 11160 df-ltxr 11161 df-le 11162 df-sub 11356 df-neg 11357 df-nn 12136 df-2 12198 df-3 12199 df-4 12200 df-5 12201 df-6 12202 df-7 12203 df-8 12204 df-9 12205 df-n0 12392 df-xnn0 12465 df-z 12479 df-dec 12599 df-uz 12743 df-fz 13418 df-hash 14248 df-struct 17068 df-sets 17085 df-slot 17103 df-ndx 17115 df-base 17131 df-ress 17152 df-plusg 17184 df-mulr 17185 df-sca 17187 df-vsca 17188 df-ip 17189 df-tset 17190 df-ple 17191 df-ocomp 17192 df-0g 17355 df-mre 17498 df-mrc 17499 df-mri 17500 df-acs 17501 df-proset 18210 df-drs 18211 df-poset 18229 df-ipo 18444 df-mgm 18558 df-sgrp 18637 df-mnd 18653 df-submnd 18702 df-grp 18859 df-minusg 18860 df-sbg 18861 df-subg 19046 df-cmn 19704 df-abl 19705 df-mgp 20069 df-rng 20081 df-ur 20110 df-ring 20163 df-oppr 20265 df-dvdsr 20285 df-unit 20286 df-invr 20316 df-subrg 20495 df-drng 20656 df-field 20657 df-lmod 20805 df-lss 20875 df-lsp 20915 df-lbs 21019 df-lvec 21047 df-sra 21117 df-dim 33623 df-fldext 33665 df-extdg 33666 |
| This theorem is referenced by: finexttrb 33689 fldextrspundglemul 33703 fldextrspundgdvdslem 33704 fldextrspundgdvds 33705 rtelextdg2 33751 constrext2chnlem 33774 |
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