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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 33904 | . 2 ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) = (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) | |
| 2 | fldextfld1 33898 | . . . . . 6 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ Field) | |
| 3 | isfld 20762 | . . . . . 6 ⊢ (𝐸 ∈ Field ↔ (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) | |
| 4 | 2, 3 | sylib 220 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) |
| 5 | 4 | simpld 497 | . . . 4 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ DivRing) |
| 6 | fldextress 33902 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 = (𝐸 ↾s (Base‘𝐹))) | |
| 7 | fldextfld2 33899 | . . . . . . 7 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ Field) | |
| 8 | isfld 20762 | . . . . . . 7 ⊢ (𝐹 ∈ Field ↔ (𝐹 ∈ DivRing ∧ 𝐹 ∈ CRing)) | |
| 9 | 7, 8 | sylib 220 | . . . . . 6 ⊢ (𝐸/FldExt𝐹 → (𝐹 ∈ DivRing ∧ 𝐹 ∈ CRing)) |
| 10 | 9 | simpld 497 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ DivRing) |
| 11 | 6, 10 | eqeltrrd 2857 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (𝐸 ↾s (Base‘𝐹)) ∈ DivRing) |
| 12 | eqid 2756 | . . . . 5 ⊢ (Base‘𝐹) = (Base‘𝐹) | |
| 13 | 12 | fldextsubrg 33900 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (Base‘𝐹) ∈ (SubRing‘𝐸)) |
| 14 | eqid 2756 | . . . . 5 ⊢ ((subringAlg ‘𝐸)‘(Base‘𝐹)) = ((subringAlg ‘𝐸)‘(Base‘𝐹)) | |
| 15 | eqid 2756 | . . . . 5 ⊢ (𝐸 ↾s (Base‘𝐹)) = (𝐸 ↾s (Base‘𝐹)) | |
| 16 | 14, 15 | sralvec 33836 | . . . 4 ⊢ ((𝐸 ∈ DivRing ∧ (𝐸 ↾s (Base‘𝐹)) ∈ DivRing ∧ (Base‘𝐹) ∈ (SubRing‘𝐸)) → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 17 | 5, 11, 13, 16 | syl3anc 1386 | . . 3 ⊢ (𝐸/FldExt𝐹 → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 18 | dimcl 33854 | . . 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 2856 | 1 ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) ∈ ℕ0*) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 398 ∈ wcel 2136 class class class wbr 5094 ‘cfv 6510 (class class class)co 7385 ℕ0*cxnn0 12544 Basecbs 17221 ↾s cress 17242 CRingccrg 20256 SubRingcsubrg 20591 DivRingcdr 20751 Fieldcfield 20752 LVecclvec 21142 subringAlg csra 21211 dimcldim 33850 /FldExtcfldext 33889 [:]cextdg 33891 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1809 ax-4 1823 ax-5 1924 ax-6 1981 ax-7 2022 ax-8 2138 ax-9 2146 ax-10 2169 ax-11 2185 ax-12 2206 ax-ext 2728 ax-rep 5221 ax-sep 5240 ax-nul 5250 ax-pow 5316 ax-pr 5384 ax-un 7707 ax-reg 9530 ax-inf2 9586 ax-ac2 10410 ax-cnex 11119 ax-resscn 11120 ax-1cn 11121 ax-icn 11122 ax-addcl 11123 ax-addrcl 11124 ax-mulcl 11125 ax-mulrcl 11126 ax-mulcom 11127 ax-addass 11128 ax-mulass 11129 ax-distr 11130 ax-i2m1 11131 ax-1ne0 11132 ax-1rid 11133 ax-rnegex 11134 ax-rrecex 11135 ax-cnre 11136 ax-pre-lttri 11137 ax-pre-lttrn 11138 ax-pre-ltadd 11139 ax-pre-mulgt0 11140 |
| This theorem depends on definitions: df-bi 209 df-an 399 df-or 857 df-3or 1096 df-3an 1097 df-tru 1557 df-fal 1567 df-ex 1794 df-nf 1798 df-sb 2085 df-mo 2560 df-eu 2590 df-clab 2735 df-cleq 2748 df-clel 2831 df-nfc 2905 df-ne 2952 df-nel 3056 df-ral 3071 df-rex 3081 df-rmo 3361 df-reu 3362 df-rab 3409 df-v 3450 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4281 df-if 4475 df-pw 4551 df-sn 4577 df-pr 4579 df-op 4583 df-uni 4860 df-int 4900 df-iun 4945 df-iin 4946 df-br 5095 df-opab 5157 df-mpt 5176 df-tr 5202 df-id 5535 df-eprel 5540 df-po 5548 df-so 5549 df-fr 5593 df-se 5594 df-we 5595 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-pred 6277 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6466 df-fun 6512 df-fn 6513 df-f 6514 df-f1 6515 df-fo 6516 df-f1o 6517 df-fv 6518 df-isom 6519 df-riota 7342 df-ov 7388 df-oprab 7389 df-mpo 7390 df-rpss 7695 df-om 7836 df-1st 7959 df-2nd 7960 df-tpos 8194 df-frecs 8250 df-wrecs 8281 df-recs 8330 df-rdg 8369 df-1o 8425 df-2o 8426 df-oadd 8429 df-er 8666 df-map 8798 df-en 8917 df-dom 8918 df-sdom 8919 df-fin 8920 df-oi 9448 df-r1 9712 df-rank 9713 df-dju 9849 df-card 9887 df-acn 9890 df-ac 10062 df-pnf 11208 df-mnf 11209 df-xr 11210 df-ltxr 11211 df-le 11212 df-sub 11406 df-neg 11407 df-nn 12201 df-2 12270 df-3 12271 df-4 12272 df-5 12273 df-6 12274 df-7 12275 df-8 12276 df-9 12277 df-n0 12472 df-xnn0 12545 df-z 12559 df-dec 12679 df-uz 12830 df-fz 13503 df-hash 14334 df-struct 17159 df-sets 17176 df-slot 17194 df-ndx 17206 df-base 17222 df-ress 17243 df-plusg 17275 df-mulr 17276 df-sca 17278 df-vsca 17279 df-ip 17280 df-tset 17281 df-ple 17282 df-ocomp 17283 df-0g 17446 df-mre 17590 df-mrc 17591 df-mri 17592 df-acs 17593 df-proset 18302 df-drs 18303 df-poset 18321 df-ipo 18536 df-mgm 18650 df-sgrp 18729 df-mnd 18745 df-submnd 18794 df-grp 18954 df-minusg 18955 df-sbg 18956 df-subg 19141 df-cmn 19798 df-abl 19799 df-mgp 20163 df-rng 20175 df-ur 20204 df-ring 20257 df-oppr 20358 df-dvdsr 20378 df-unit 20379 df-invr 20409 df-subrg 20592 df-drng 20753 df-field 20754 df-lmod 20902 df-lss 20972 df-lsp 21012 df-lbs 21115 df-lvec 21143 df-sra 21213 df-dim 33851 df-fldext 33892 df-extdg 33893 |
| This theorem is referenced by: finexttrb 33916 fldextrspundglemul 33930 fldextrspundgdvdslem 33931 fldextrspundgdvds 33932 rtelextdg2 33978 constrext2chnlem 34001 |
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