| Mathbox for Thierry Arnoux |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > extdggt0 | Structured version Visualization version GIF version | ||
| Description: Degrees of field extension are greater than zero. (Contributed by Thierry Arnoux, 30-Jul-2023.) |
| Ref | Expression |
|---|---|
| extdggt0 | ⊢ (𝐸/FldExt𝐹 → 0 < (𝐸[:]𝐹)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fldextfld1 33643 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ Field) | |
| 2 | isfld 20649 | . . . . . 6 ⊢ (𝐸 ∈ Field ↔ (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) | |
| 3 | 2 | simplbi 497 | . . . . 5 ⊢ (𝐸 ∈ Field → 𝐸 ∈ DivRing) |
| 4 | 1, 3 | syl 17 | . . . 4 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ DivRing) |
| 5 | fldextress 33647 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 = (𝐸 ↾s (Base‘𝐹))) | |
| 6 | fldextfld2 33644 | . . . . . 6 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ Field) | |
| 7 | isfld 20649 | . . . . . . 7 ⊢ (𝐹 ∈ Field ↔ (𝐹 ∈ DivRing ∧ 𝐹 ∈ CRing)) | |
| 8 | 7 | simplbi 497 | . . . . . 6 ⊢ (𝐹 ∈ Field → 𝐹 ∈ DivRing) |
| 9 | 6, 8 | syl 17 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ DivRing) |
| 10 | 5, 9 | eqeltrrd 2829 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (𝐸 ↾s (Base‘𝐹)) ∈ DivRing) |
| 11 | eqid 2729 | . . . . 5 ⊢ (Base‘𝐹) = (Base‘𝐹) | |
| 12 | 11 | fldextsubrg 33645 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (Base‘𝐹) ∈ (SubRing‘𝐸)) |
| 13 | eqid 2729 | . . . . 5 ⊢ ((subringAlg ‘𝐸)‘(Base‘𝐹)) = ((subringAlg ‘𝐸)‘(Base‘𝐹)) | |
| 14 | eqid 2729 | . . . . 5 ⊢ (𝐸 ↾s (Base‘𝐹)) = (𝐸 ↾s (Base‘𝐹)) | |
| 15 | 13, 14 | sralvec 33581 | . . . 4 ⊢ ((𝐸 ∈ DivRing ∧ (𝐸 ↾s (Base‘𝐹)) ∈ DivRing ∧ (Base‘𝐹) ∈ (SubRing‘𝐸)) → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 16 | 4, 10, 12, 15 | syl3anc 1373 | . . 3 ⊢ (𝐸/FldExt𝐹 → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 17 | eqid 2729 | . . . . . 6 ⊢ (Base‘𝐸) = (Base‘𝐸) | |
| 18 | 17 | subrgss 20481 | . . . . 5 ⊢ ((Base‘𝐹) ∈ (SubRing‘𝐸) → (Base‘𝐹) ⊆ (Base‘𝐸)) |
| 19 | 12, 18 | syl 17 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (Base‘𝐹) ⊆ (Base‘𝐸)) |
| 20 | 13, 17 | sradrng 33578 | . . . 4 ⊢ ((𝐸 ∈ DivRing ∧ (Base‘𝐹) ⊆ (Base‘𝐸)) → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ DivRing) |
| 21 | 4, 19, 20 | syl2anc 584 | . . 3 ⊢ (𝐸/FldExt𝐹 → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ DivRing) |
| 22 | drngdimgt0 33614 | . . 3 ⊢ ((((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec ∧ ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ DivRing) → 0 < (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) | |
| 23 | 16, 21, 22 | syl2anc 584 | . 2 ⊢ (𝐸/FldExt𝐹 → 0 < (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) |
| 24 | extdgval 33649 | . 2 ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) = (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) | |
| 25 | 23, 24 | breqtrrd 5135 | 1 ⊢ (𝐸/FldExt𝐹 → 0 < (𝐸[:]𝐹)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2109 ⊆ wss 3914 class class class wbr 5107 ‘cfv 6511 (class class class)co 7387 0cc0 11068 < clt 11208 Basecbs 17179 ↾s cress 17200 CRingccrg 20143 SubRingcsubrg 20478 DivRingcdr 20638 Fieldcfield 20639 LVecclvec 21009 subringAlg csra 21078 dimcldim 33594 /FldExtcfldext 33634 [:]cextdg 33636 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5234 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711 ax-reg 9545 ax-inf2 9594 ax-ac2 10416 ax-cnex 11124 ax-resscn 11125 ax-1cn 11126 ax-icn 11127 ax-addcl 11128 ax-addrcl 11129 ax-mulcl 11130 ax-mulrcl 11131 ax-mulcom 11132 ax-addass 11133 ax-mulass 11134 ax-distr 11135 ax-i2m1 11136 ax-1ne0 11137 ax-1rid 11138 ax-rnegex 11139 ax-rrecex 11140 ax-cnre 11141 ax-pre-lttri 11142 ax-pre-lttrn 11143 ax-pre-ltadd 11144 ax-pre-mulgt0 11145 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3354 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-csb 3863 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3934 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-int 4911 df-iun 4957 df-iin 4958 df-br 5108 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5533 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5591 df-se 5592 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-pred 6274 df-ord 6335 df-on 6336 df-lim 6337 df-suc 6338 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-isom 6520 df-riota 7344 df-ov 7390 df-oprab 7391 df-mpo 7392 df-rpss 7699 df-om 7843 df-1st 7968 df-2nd 7969 df-tpos 8205 df-frecs 8260 df-wrecs 8291 df-recs 8340 df-rdg 8378 df-1o 8434 df-2o 8435 df-oadd 8438 df-er 8671 df-map 8801 df-en 8919 df-dom 8920 df-sdom 8921 df-fin 8922 df-oi 9463 df-r1 9717 df-rank 9718 df-dju 9854 df-card 9892 df-acn 9895 df-ac 10069 df-pnf 11210 df-mnf 11211 df-xr 11212 df-ltxr 11213 df-le 11214 df-sub 11407 df-neg 11408 df-nn 12187 df-2 12249 df-3 12250 df-4 12251 df-5 12252 df-6 12253 df-7 12254 df-8 12255 df-9 12256 df-n0 12443 df-xnn0 12516 df-z 12530 df-dec 12650 df-uz 12794 df-fz 13469 df-hash 14296 df-struct 17117 df-sets 17134 df-slot 17152 df-ndx 17164 df-base 17180 df-ress 17201 df-plusg 17233 df-mulr 17234 df-sca 17236 df-vsca 17237 df-ip 17238 df-tset 17239 df-ple 17240 df-ocomp 17241 df-0g 17404 df-mre 17547 df-mrc 17548 df-mri 17549 df-acs 17550 df-proset 18255 df-drs 18256 df-poset 18274 df-ipo 18487 df-mgm 18567 df-sgrp 18646 df-mnd 18662 df-submnd 18711 df-grp 18868 df-minusg 18869 df-sbg 18870 df-subg 19055 df-cmn 19712 df-abl 19713 df-mgp 20050 df-rng 20062 df-ur 20091 df-ring 20144 df-oppr 20246 df-dvdsr 20266 df-unit 20267 df-invr 20297 df-nzr 20422 df-subrg 20479 df-drng 20640 df-field 20641 df-lmod 20768 df-lss 20838 df-lsp 20878 df-lbs 20982 df-lvec 21010 df-sra 21080 df-lindf 21715 df-linds 21716 df-dim 33595 df-fldext 33637 df-extdg 33638 |
| This theorem is referenced by: finexttrb 33660 fldext2rspun 33677 rtelextdg2 33717 constrext2chnlem 33740 |
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