| 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 33791 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ Field) | |
| 2 | isfld 20717 | . . . . . 6 ⊢ (𝐸 ∈ Field ↔ (𝐸 ∈ DivRing ∧ 𝐸 ∈ CRing)) | |
| 3 | 2 | simplbi 496 | . . . . 5 ⊢ (𝐸 ∈ Field → 𝐸 ∈ DivRing) |
| 4 | 1, 3 | syl 17 | . . . 4 ⊢ (𝐸/FldExt𝐹 → 𝐸 ∈ DivRing) |
| 5 | fldextress 33795 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 = (𝐸 ↾s (Base‘𝐹))) | |
| 6 | fldextfld2 33792 | . . . . . 6 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ Field) | |
| 7 | isfld 20717 | . . . . . . 7 ⊢ (𝐹 ∈ Field ↔ (𝐹 ∈ DivRing ∧ 𝐹 ∈ CRing)) | |
| 8 | 7 | simplbi 496 | . . . . . 6 ⊢ (𝐹 ∈ Field → 𝐹 ∈ DivRing) |
| 9 | 6, 8 | syl 17 | . . . . 5 ⊢ (𝐸/FldExt𝐹 → 𝐹 ∈ DivRing) |
| 10 | 5, 9 | eqeltrrd 2837 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (𝐸 ↾s (Base‘𝐹)) ∈ DivRing) |
| 11 | eqid 2736 | . . . . 5 ⊢ (Base‘𝐹) = (Base‘𝐹) | |
| 12 | 11 | fldextsubrg 33793 | . . . 4 ⊢ (𝐸/FldExt𝐹 → (Base‘𝐹) ∈ (SubRing‘𝐸)) |
| 13 | eqid 2736 | . . . . 5 ⊢ ((subringAlg ‘𝐸)‘(Base‘𝐹)) = ((subringAlg ‘𝐸)‘(Base‘𝐹)) | |
| 14 | eqid 2736 | . . . . 5 ⊢ (𝐸 ↾s (Base‘𝐹)) = (𝐸 ↾s (Base‘𝐹)) | |
| 15 | 13, 14 | sralvec 33729 | . . . 4 ⊢ ((𝐸 ∈ DivRing ∧ (𝐸 ↾s (Base‘𝐹)) ∈ DivRing ∧ (Base‘𝐹) ∈ (SubRing‘𝐸)) → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 16 | 4, 10, 12, 15 | syl3anc 1374 | . . 3 ⊢ (𝐸/FldExt𝐹 → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec) |
| 17 | eqid 2736 | . . . . . 6 ⊢ (Base‘𝐸) = (Base‘𝐸) | |
| 18 | 17 | subrgss 20549 | . . . . 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 33726 | . . . 4 ⊢ ((𝐸 ∈ DivRing ∧ (Base‘𝐹) ⊆ (Base‘𝐸)) → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ DivRing) |
| 21 | 4, 19, 20 | syl2anc 585 | . . 3 ⊢ (𝐸/FldExt𝐹 → ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ DivRing) |
| 22 | drngdimgt0 33762 | . . 3 ⊢ ((((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ LVec ∧ ((subringAlg ‘𝐸)‘(Base‘𝐹)) ∈ DivRing) → 0 < (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) | |
| 23 | 16, 21, 22 | syl2anc 585 | . 2 ⊢ (𝐸/FldExt𝐹 → 0 < (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) |
| 24 | extdgval 33797 | . 2 ⊢ (𝐸/FldExt𝐹 → (𝐸[:]𝐹) = (dim‘((subringAlg ‘𝐸)‘(Base‘𝐹)))) | |
| 25 | 23, 24 | breqtrrd 5113 | 1 ⊢ (𝐸/FldExt𝐹 → 0 < (𝐸[:]𝐹)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ⊆ wss 3889 class class class wbr 5085 ‘cfv 6498 (class class class)co 7367 0cc0 11038 < clt 11179 Basecbs 17179 ↾s cress 17200 CRingccrg 20215 SubRingcsubrg 20546 DivRingcdr 20706 Fieldcfield 20707 LVecclvec 21097 subringAlg csra 21166 dimcldim 33743 /FldExtcfldext 33782 [:]cextdg 33784 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-rep 5212 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-reg 9507 ax-inf2 9562 ax-ac2 10385 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-rmo 3342 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-int 4890 df-iun 4935 df-iin 4936 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-se 5585 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-isom 6507 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-rpss 7677 df-om 7818 df-1st 7942 df-2nd 7943 df-tpos 8176 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-1o 8405 df-2o 8406 df-oadd 8409 df-er 8643 df-map 8775 df-en 8894 df-dom 8895 df-sdom 8896 df-fin 8897 df-oi 9425 df-r1 9688 df-rank 9689 df-dju 9825 df-card 9863 df-acn 9866 df-ac 10038 df-pnf 11181 df-mnf 11182 df-xr 11183 df-ltxr 11184 df-le 11185 df-sub 11379 df-neg 11380 df-nn 12175 df-2 12244 df-3 12245 df-4 12246 df-5 12247 df-6 12248 df-7 12249 df-8 12250 df-9 12251 df-n0 12438 df-xnn0 12511 df-z 12525 df-dec 12645 df-uz 12789 df-fz 13462 df-hash 14293 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 17548 df-mrc 17549 df-mri 17550 df-acs 17551 df-proset 18260 df-drs 18261 df-poset 18279 df-ipo 18494 df-mgm 18608 df-sgrp 18687 df-mnd 18703 df-submnd 18752 df-grp 18912 df-minusg 18913 df-sbg 18914 df-subg 19099 df-cmn 19757 df-abl 19758 df-mgp 20122 df-rng 20134 df-ur 20163 df-ring 20216 df-oppr 20317 df-dvdsr 20337 df-unit 20338 df-invr 20368 df-nzr 20490 df-subrg 20547 df-drng 20708 df-field 20709 df-lmod 20857 df-lss 20927 df-lsp 20967 df-lbs 21070 df-lvec 21098 df-sra 21168 df-lindf 21786 df-linds 21787 df-dim 33744 df-fldext 33785 df-extdg 33786 |
| This theorem is referenced by: finexttrb 33809 fldext2rspun 33826 rtelextdg2 33871 constrext2chnlem 33894 |
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