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Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > extdgid | Structured version Visualization version GIF version |
Description: A trivial field extension has degree one. (Contributed by Thierry Arnoux, 4-Aug-2023.) |
Ref | Expression |
---|---|
extdgid | โข (๐ธ โ Field โ (๐ธ[:]๐ธ) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | fldextid 33384 | . . 3 โข (๐ธ โ Field โ ๐ธ/FldExt๐ธ) | |
2 | extdgval 33379 | . . 3 โข (๐ธ/FldExt๐ธ โ (๐ธ[:]๐ธ) = (dimโ((subringAlg โ๐ธ)โ(Baseโ๐ธ)))) | |
3 | 1, 2 | syl 17 | . 2 โข (๐ธ โ Field โ (๐ธ[:]๐ธ) = (dimโ((subringAlg โ๐ธ)โ(Baseโ๐ธ)))) |
4 | isfld 20642 | . . . 4 โข (๐ธ โ Field โ (๐ธ โ DivRing โง ๐ธ โ CRing)) | |
5 | 4 | simplbi 496 | . . 3 โข (๐ธ โ Field โ ๐ธ โ DivRing) |
6 | rlmval 21091 | . . . . 5 โข (ringLModโ๐ธ) = ((subringAlg โ๐ธ)โ(Baseโ๐ธ)) | |
7 | 6 | eqcomi 2737 | . . . 4 โข ((subringAlg โ๐ธ)โ(Baseโ๐ธ)) = (ringLModโ๐ธ) |
8 | 7 | rlmdim 33340 | . . 3 โข (๐ธ โ DivRing โ (dimโ((subringAlg โ๐ธ)โ(Baseโ๐ธ))) = 1) |
9 | 5, 8 | syl 17 | . 2 โข (๐ธ โ Field โ (dimโ((subringAlg โ๐ธ)โ(Baseโ๐ธ))) = 1) |
10 | 3, 9 | eqtrd 2768 | 1 โข (๐ธ โ Field โ (๐ธ[:]๐ธ) = 1) |
Colors of variables: wff setvar class |
Syntax hints: โ wi 4 = wceq 1533 โ wcel 2098 class class class wbr 5152 โcfv 6553 (class class class)co 7426 1c1 11147 Basecbs 17187 CRingccrg 20181 DivRingcdr 20631 Fieldcfield 20632 subringAlg csra 21063 ringLModcrglmod 21064 dimcldim 33329 /FldExtcfldext 33363 [:]cextdg 33366 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2699 ax-rep 5289 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-reg 9623 ax-inf2 9672 ax-ac2 10494 ax-cnex 11202 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-op 4639 df-uni 4913 df-int 4954 df-iun 5002 df-iin 5003 df-br 5153 df-opab 5215 df-mpt 5236 df-tr 5270 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-se 5638 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6310 df-ord 6377 df-on 6378 df-lim 6379 df-suc 6380 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-isom 6562 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-om 7877 df-1st 7999 df-2nd 8000 df-tpos 8238 df-frecs 8293 df-wrecs 8324 df-recs 8398 df-rdg 8437 df-1o 8493 df-er 8731 df-map 8853 df-en 8971 df-dom 8972 df-sdom 8973 df-fin 8974 df-oi 9541 df-r1 9795 df-rank 9796 df-card 9970 df-acn 9973 df-ac 10147 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11484 df-neg 11485 df-nn 12251 df-2 12313 df-3 12314 df-4 12315 df-5 12316 df-6 12317 df-7 12318 df-8 12319 df-9 12320 df-n0 12511 df-xnn0 12583 df-z 12597 df-dec 12716 df-uz 12861 df-fz 13525 df-hash 14330 df-struct 17123 df-sets 17140 df-slot 17158 df-ndx 17170 df-base 17188 df-ress 17217 df-plusg 17253 df-mulr 17254 df-sca 17256 df-vsca 17257 df-ip 17258 df-tset 17259 df-ple 17260 df-ocomp 17261 df-0g 17430 df-mre 17573 df-mrc 17574 df-mri 17575 df-acs 17576 df-proset 18294 df-drs 18295 df-poset 18312 df-ipo 18527 df-mgm 18607 df-sgrp 18686 df-mnd 18702 df-submnd 18748 df-grp 18900 df-minusg 18901 df-sbg 18902 df-subg 19085 df-cmn 19744 df-abl 19745 df-mgp 20082 df-rng 20100 df-ur 20129 df-ring 20182 df-oppr 20280 df-dvdsr 20303 df-unit 20304 df-invr 20334 df-subrg 20515 df-drng 20633 df-field 20634 df-lmod 20752 df-lss 20823 df-lsp 20863 df-lbs 20967 df-lvec 20995 df-sra 21065 df-rgmod 21066 df-lidl 21111 df-rsp 21112 df-lindf 21747 df-linds 21748 df-dim 33330 df-fldext 33367 df-extdg 33368 |
This theorem is referenced by: extdg1b 33389 |
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