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Theorem matdim 32700

Description: Dimension of the space of square matrices. (Contributed by Thierry Arnoux, 20-May-2023.)

**Hypotheses**
Ref	Expression
matdim.a	⊢ 𝐴 = (𝐼 Mat 𝑅)
matdim.n	⊢ 𝑁 = (♯‘𝐼)

**Assertion**
Ref	Expression
matdim	⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘𝐴) = (𝑁 · 𝑁))

Proof of Theorem matdim Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpr 486	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝑅 ∈ DivRing)
2		simpl 484	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝐼 ∈ Fin)
3		xpfi 9317	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝐼 ∈ Fin) → (𝐼 × 𝐼) ∈ Fin)
4	2, 2, 3	syl2anc 585	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (𝐼 × 𝐼) ∈ Fin)
5		eqid 2733	. . . . 5 ⊢ (𝑅 freeLMod (𝐼 × 𝐼)) = (𝑅 freeLMod (𝐼 × 𝐼))
6	5	frlmdim 32696	. . . 4 ⊢ ((𝑅 ∈ DivRing ∧ (𝐼 × 𝐼) ∈ Fin) → (dim‘(𝑅 freeLMod (𝐼 × 𝐼))) = (♯‘(𝐼 × 𝐼)))
7	1, 4, 6	syl2anc 585	. . 3 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘(𝑅 freeLMod (𝐼 × 𝐼))) = (♯‘(𝐼 × 𝐼)))
8		matdim.a	. . . . . 6 ⊢ 𝐴 = (𝐼 Mat 𝑅)
9	8, 5	matbas 21913	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘(𝑅 freeLMod (𝐼 × 𝐼))) = (Base‘𝐴))
10	9	eqcomd 2739	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘𝐴) = (Base‘(𝑅 freeLMod (𝐼 × 𝐼))))
11		eqidd 2734	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘𝐴) = (Base‘𝐴))
12		ssidd 4006	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘𝐴) ⊆ (Base‘𝐴))
13	8, 5	matplusg 21914	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (+_g‘(𝑅 freeLMod (𝐼 × 𝐼))) = (+_g‘𝐴))
14	13	oveqdr 7437	. . . 4 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘𝐴) ∧ 𝑦 ∈ (Base‘𝐴))) → (𝑥(+_g‘(𝑅 freeLMod (𝐼 × 𝐼)))𝑦) = (𝑥(+_g‘𝐴)𝑦))
15	5	frlmlvec 21316	. . . . . . . . 9 ⊢ ((𝑅 ∈ DivRing ∧ (𝐼 × 𝐼) ∈ Fin) → (𝑅 freeLMod (𝐼 × 𝐼)) ∈ LVec)
16	1, 4, 15	syl2anc 585	. . . . . . . 8 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (𝑅 freeLMod (𝐼 × 𝐼)) ∈ LVec)
17		lveclmod 20717	. . . . . . . 8 ⊢ ((𝑅 freeLMod (𝐼 × 𝐼)) ∈ LVec → (𝑅 freeLMod (𝐼 × 𝐼)) ∈ LMod)
18	16, 17	syl 17	. . . . . . 7 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (𝑅 freeLMod (𝐼 × 𝐼)) ∈ LMod)
19	18	adantr 482	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → (𝑅 freeLMod (𝐼 × 𝐼)) ∈ LMod)
20		simprl 770	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → 𝑥 ∈ (Base‘(Scalar‘𝐴)))
21	8, 5	matsca 21915	. . . . . . . . . 10 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Scalar‘(𝑅 freeLMod (𝐼 × 𝐼))) = (Scalar‘𝐴))
22	21	fveq2d 6896	. . . . . . . . 9 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))) = (Base‘(Scalar‘𝐴)))
23	22	eqcomd 2739	. . . . . . . 8 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘(Scalar‘𝐴)) = (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))))
24	23	adantr 482	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → (Base‘(Scalar‘𝐴)) = (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))))
25	20, 24	eleqtrd 2836	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → 𝑥 ∈ (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))))
26		simprr 772	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → 𝑦 ∈ (Base‘𝐴))
27	10	adantr 482	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → (Base‘𝐴) = (Base‘(𝑅 freeLMod (𝐼 × 𝐼))))
28	26, 27	eleqtrd 2836	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → 𝑦 ∈ (Base‘(𝑅 freeLMod (𝐼 × 𝐼))))
29		eqid 2733	. . . . . . 7 ⊢ (Base‘(𝑅 freeLMod (𝐼 × 𝐼))) = (Base‘(𝑅 freeLMod (𝐼 × 𝐼)))
30		eqid 2733	. . . . . . 7 ⊢ (Scalar‘(𝑅 freeLMod (𝐼 × 𝐼))) = (Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))
31		eqid 2733	. . . . . . 7 ⊢ ( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼))) = ( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼)))
32		eqid 2733	. . . . . . 7 ⊢ (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))) = (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼))))
33	29, 30, 31, 32	lmodvscl 20489	. . . . . 6 ⊢ (((𝑅 freeLMod (𝐼 × 𝐼)) ∈ LMod ∧ 𝑥 ∈ (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))) ∧ 𝑦 ∈ (Base‘(𝑅 freeLMod (𝐼 × 𝐼)))) → (𝑥( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼)))𝑦) ∈ (Base‘(𝑅 freeLMod (𝐼 × 𝐼))))
34	19, 25, 28, 33	syl3anc 1372	. . . . 5 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → (𝑥( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼)))𝑦) ∈ (Base‘(𝑅 freeLMod (𝐼 × 𝐼))))
35	34, 27	eleqtrrd 2837	. . . 4 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → (𝑥( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼)))𝑦) ∈ (Base‘𝐴))
36	8, 5	matvsca 21917	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → ( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼))) = ( ·_𝑠 ‘𝐴))
37	36	oveqdr 7437	. . . 4 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → (𝑥( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼)))𝑦) = (𝑥( ·_𝑠 ‘𝐴)𝑦))
38		eqid 2733	. . . 4 ⊢ (Scalar‘𝐴) = (Scalar‘𝐴)
39		eqidd 2734	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘(Scalar‘𝐴)) = (Base‘(Scalar‘𝐴)))
40	21	fveq2d 6896	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (+_g‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))) = (+_g‘(Scalar‘𝐴)))
41	40	oveqdr 7437	. . . 4 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘(Scalar‘𝐴)))) → (𝑥(+_g‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼))))𝑦) = (𝑥(+_g‘(Scalar‘𝐴))𝑦))
42		drngring 20364	. . . . . 6 ⊢ (𝑅 ∈ DivRing → 𝑅 ∈ Ring)
43	8	matlmod 21931	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ Ring) → 𝐴 ∈ LMod)
44	42, 43	sylan2 594	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝐴 ∈ LMod)
45	8	matsca2 21922	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝑅 = (Scalar‘𝐴))
46	45, 1	eqeltrrd 2835	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Scalar‘𝐴) ∈ DivRing)
47	38	islvec 20715	. . . . 5 ⊢ (𝐴 ∈ LVec ↔ (𝐴 ∈ LMod ∧ (Scalar‘𝐴) ∈ DivRing))
48	44, 46, 47	sylanbrc 584	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝐴 ∈ LVec)
49	10, 11, 12, 14, 35, 37, 30, 38, 23, 39, 41, 16, 48	dimpropd 32693	. . 3 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘(𝑅 freeLMod (𝐼 × 𝐼))) = (dim‘𝐴))
50		hashxp 14394	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝐼 ∈ Fin) → (♯‘(𝐼 × 𝐼)) = ((♯‘𝐼) · (♯‘𝐼)))
51	2, 2, 50	syl2anc 585	. . 3 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (♯‘(𝐼 × 𝐼)) = ((♯‘𝐼) · (♯‘𝐼)))
52	7, 49, 51	3eqtr3d 2781	. 2 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘𝐴) = ((♯‘𝐼) · (♯‘𝐼)))
53		matdim.n	. . 3 ⊢ 𝑁 = (♯‘𝐼)
54	53, 53	oveq12i 7421	. 2 ⊢ (𝑁 · 𝑁) = ((♯‘𝐼) · (♯‘𝐼))
55	52, 54	eqtr4di 2791	1 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘𝐴) = (𝑁 · 𝑁))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 397 = wceq 1542 ∈ wcel 2107 × cxp 5675 ‘cfv 6544 (class class class)co 7409 Fincfn 8939 · cmul 11115 ♯chash 14290 Basecbs 17144 +_gcplusg 17197 Scalarcsca 17200 ·_𝑠 cvsca 17201 Ringcrg 20056 DivRingcdr 20357 LModclmod 20471 LVecclvec 20713 freeLMod cfrlm 21301 Mat cmat 21907 dimcldim 32684

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-reg 9587 ax-inf2 9636 ax-ac2 10458 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-tp 4634 df-op 4636 df-ot 4638 df-uni 4910 df-int 4952 df-iun 5000 df-iin 5001 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-se 5633 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-isom 6553 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-of 7670 df-rpss 7713 df-om 7856 df-1st 7975 df-2nd 7976 df-supp 8147 df-tpos 8211 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-oadd 8470 df-er 8703 df-map 8822 df-ixp 8892 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-fsupp 9362 df-sup 9437 df-oi 9505 df-r1 9759 df-rank 9760 df-dju 9896 df-card 9934 df-acn 9937 df-ac 10111 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-nn 12213 df-2 12275 df-3 12276 df-4 12277 df-5 12278 df-6 12279 df-7 12280 df-8 12281 df-9 12282 df-n0 12473 df-xnn0 12545 df-z 12559 df-dec 12678 df-uz 12823 df-fz 13485 df-fzo 13628 df-seq 13967 df-hash 14291 df-struct 17080 df-sets 17097 df-slot 17115 df-ndx 17127 df-base 17145 df-ress 17174 df-plusg 17210 df-mulr 17211 df-sca 17213 df-vsca 17214 df-ip 17215 df-tset 17216 df-ple 17217 df-ocomp 17218 df-ds 17219 df-hom 17221 df-cco 17222 df-0g 17387 df-gsum 17388 df-prds 17393 df-pws 17395 df-mre 17530 df-mrc 17531 df-mri 17532 df-acs 17533 df-proset 18248 df-drs 18249 df-poset 18266 df-ipo 18481 df-mgm 18561 df-sgrp 18610 df-mnd 18626 df-mhm 18671 df-submnd 18672 df-grp 18822 df-minusg 18823 df-sbg 18824 df-mulg 18951 df-subg 19003 df-ghm 19090 df-cntz 19181 df-cmn 19650 df-abl 19651 df-mgp 19988 df-ur 20005 df-ring 20058 df-oppr 20150 df-dvdsr 20171 df-unit 20172 df-invr 20202 df-nzr 20292 df-subrg 20317 df-drng 20359 df-lmod 20473 df-lss 20543 df-lsp 20583 df-lmhm 20633 df-lbs 20686 df-lvec 20714 df-sra 20785 df-rgmod 20786 df-dsmm 21287 df-frlm 21302 df-uvc 21338 df-mat 21908 df-dim 32685

This theorem is referenced by: (None)

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