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Theorem matdim 32986

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 483	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝑅 ∈ DivRing)
2		simpl 481	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝐼 ∈ Fin)
3		xpfi 9321	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝐼 ∈ Fin) → (𝐼 × 𝐼) ∈ Fin)
4	2, 2, 3	syl2anc 582	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (𝐼 × 𝐼) ∈ Fin)
5		eqid 2730	. . . . 5 ⊢ (𝑅 freeLMod (𝐼 × 𝐼)) = (𝑅 freeLMod (𝐼 × 𝐼))
6	5	frlmdim 32982	. . . 4 ⊢ ((𝑅 ∈ DivRing ∧ (𝐼 × 𝐼) ∈ Fin) → (dim‘(𝑅 freeLMod (𝐼 × 𝐼))) = (♯‘(𝐼 × 𝐼)))
7	1, 4, 6	syl2anc 582	. . 3 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘(𝑅 freeLMod (𝐼 × 𝐼))) = (♯‘(𝐼 × 𝐼)))
8		matdim.a	. . . . . 6 ⊢ 𝐴 = (𝐼 Mat 𝑅)
9	8, 5	matbas 22135	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘(𝑅 freeLMod (𝐼 × 𝐼))) = (Base‘𝐴))
10	9	eqcomd 2736	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘𝐴) = (Base‘(𝑅 freeLMod (𝐼 × 𝐼))))
11		eqidd 2731	. . . 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 22136	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (+_g‘(𝑅 freeLMod (𝐼 × 𝐼))) = (+_g‘𝐴))
14	13	oveqdr 7441	. . . 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 21537	. . . . . . . . 9 ⊢ ((𝑅 ∈ DivRing ∧ (𝐼 × 𝐼) ∈ Fin) → (𝑅 freeLMod (𝐼 × 𝐼)) ∈ LVec)
16	1, 4, 15	syl2anc 582	. . . . . . . 8 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (𝑅 freeLMod (𝐼 × 𝐼)) ∈ LVec)
17		lveclmod 20863	. . . . . . . 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 479	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → (𝑅 freeLMod (𝐼 × 𝐼)) ∈ LMod)
20		simprl 767	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → 𝑥 ∈ (Base‘(Scalar‘𝐴)))
21	8, 5	matsca 22137	. . . . . . . . . 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 2736	. . . . . . . 8 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Base‘(Scalar‘𝐴)) = (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))))
24	23	adantr 479	. . . . . . 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 2833	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → 𝑥 ∈ (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))))
26		simprr 769	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → 𝑦 ∈ (Base‘𝐴))
27	10	adantr 479	. . . . . . 7 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → (Base‘𝐴) = (Base‘(𝑅 freeLMod (𝐼 × 𝐼))))
28	26, 27	eleqtrd 2833	. . . . . 6 ⊢ (((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) ∧ (𝑥 ∈ (Base‘(Scalar‘𝐴)) ∧ 𝑦 ∈ (Base‘𝐴))) → 𝑦 ∈ (Base‘(𝑅 freeLMod (𝐼 × 𝐼))))
29		eqid 2730	. . . . . . 7 ⊢ (Base‘(𝑅 freeLMod (𝐼 × 𝐼))) = (Base‘(𝑅 freeLMod (𝐼 × 𝐼)))
30		eqid 2730	. . . . . . 7 ⊢ (Scalar‘(𝑅 freeLMod (𝐼 × 𝐼))) = (Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))
31		eqid 2730	. . . . . . 7 ⊢ ( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼))) = ( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼)))
32		eqid 2730	. . . . . . 7 ⊢ (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼)))) = (Base‘(Scalar‘(𝑅 freeLMod (𝐼 × 𝐼))))
33	29, 30, 31, 32	lmodvscl 20634	. . . . . 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 1369	. . . . 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 2834	. . . 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 22139	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → ( ·_𝑠 ‘(𝑅 freeLMod (𝐼 × 𝐼))) = ( ·_𝑠 ‘𝐴))
37	36	oveqdr 7441	. . . 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 2730	. . . 4 ⊢ (Scalar‘𝐴) = (Scalar‘𝐴)
39		eqidd 2731	. . . 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 7441	. . . 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 20509	. . . . . 6 ⊢ (𝑅 ∈ DivRing → 𝑅 ∈ Ring)
43	8	matlmod 22153	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ Ring) → 𝐴 ∈ LMod)
44	42, 43	sylan2 591	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝐴 ∈ LMod)
45	8	matsca2 22144	. . . . . 6 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝑅 = (Scalar‘𝐴))
46	45, 1	eqeltrrd 2832	. . . . 5 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (Scalar‘𝐴) ∈ DivRing)
47	38	islvec 20861	. . . . 5 ⊢ (𝐴 ∈ LVec ↔ (𝐴 ∈ LMod ∧ (Scalar‘𝐴) ∈ DivRing))
48	44, 46, 47	sylanbrc 581	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → 𝐴 ∈ LVec)
49	10, 11, 12, 14, 35, 37, 30, 38, 23, 39, 41, 16, 48	dimpropd 32979	. . 3 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘(𝑅 freeLMod (𝐼 × 𝐼))) = (dim‘𝐴))
50		hashxp 14400	. . . 4 ⊢ ((𝐼 ∈ Fin ∧ 𝐼 ∈ Fin) → (♯‘(𝐼 × 𝐼)) = ((♯‘𝐼) · (♯‘𝐼)))
51	2, 2, 50	syl2anc 582	. . 3 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (♯‘(𝐼 × 𝐼)) = ((♯‘𝐼) · (♯‘𝐼)))
52	7, 49, 51	3eqtr3d 2778	. 2 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘𝐴) = ((♯‘𝐼) · (♯‘𝐼)))
53		matdim.n	. . 3 ⊢ 𝑁 = (♯‘𝐼)
54	53, 53	oveq12i 7425	. 2 ⊢ (𝑁 · 𝑁) = ((♯‘𝐼) · (♯‘𝐼))
55	52, 54	eqtr4di 2788	1 ⊢ ((𝐼 ∈ Fin ∧ 𝑅 ∈ DivRing) → (dim‘𝐴) = (𝑁 · 𝑁))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 394 = wceq 1539 ∈ wcel 2104 × cxp 5675 ‘cfv 6544 (class class class)co 7413 Fincfn 8943 · cmul 11119 ♯chash 14296 Basecbs 17150 +_gcplusg 17203 Scalarcsca 17206 ·_𝑠 cvsca 17207 Ringcrg 20129 DivRingcdr 20502 LModclmod 20616 LVecclvec 20859 freeLMod cfrlm 21522 Mat cmat 22129 dimcldim 32969

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 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7729 ax-reg 9591 ax-inf2 9640 ax-ac2 10462 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 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 7369 df-ov 7416 df-oprab 7417 df-mpo 7418 df-of 7674 df-rpss 7717 df-om 7860 df-1st 7979 df-2nd 7980 df-supp 8151 df-tpos 8215 df-frecs 8270 df-wrecs 8301 df-recs 8375 df-rdg 8414 df-1o 8470 df-oadd 8474 df-er 8707 df-map 8826 df-ixp 8896 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-fsupp 9366 df-sup 9441 df-oi 9509 df-r1 9763 df-rank 9764 df-dju 9900 df-card 9938 df-acn 9941 df-ac 10115 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11452 df-neg 11453 df-nn 12219 df-2 12281 df-3 12282 df-4 12283 df-5 12284 df-6 12285 df-7 12286 df-8 12287 df-9 12288 df-n0 12479 df-xnn0 12551 df-z 12565 df-dec 12684 df-uz 12829 df-fz 13491 df-fzo 13634 df-seq 13973 df-hash 14297 df-struct 17086 df-sets 17103 df-slot 17121 df-ndx 17133 df-base 17151 df-ress 17180 df-plusg 17216 df-mulr 17217 df-sca 17219 df-vsca 17220 df-ip 17221 df-tset 17222 df-ple 17223 df-ocomp 17224 df-ds 17225 df-hom 17227 df-cco 17228 df-0g 17393 df-gsum 17394 df-prds 17399 df-pws 17401 df-mre 17536 df-mrc 17537 df-mri 17538 df-acs 17539 df-proset 18254 df-drs 18255 df-poset 18272 df-ipo 18487 df-mgm 18567 df-sgrp 18646 df-mnd 18662 df-mhm 18707 df-submnd 18708 df-grp 18860 df-minusg 18861 df-sbg 18862 df-mulg 18989 df-subg 19041 df-ghm 19130 df-cntz 19224 df-cmn 19693 df-abl 19694 df-mgp 20031 df-rng 20049 df-ur 20078 df-ring 20131 df-oppr 20227 df-dvdsr 20250 df-unit 20251 df-invr 20281 df-nzr 20406 df-subrg 20461 df-drng 20504 df-lmod 20618 df-lss 20689 df-lsp 20729 df-lmhm 20779 df-lbs 20832 df-lvec 20860 df-sra 20932 df-rgmod 20933 df-dsmm 21508 df-frlm 21523 df-uvc 21559 df-mat 22130 df-dim 32970

This theorem is referenced by: (None)

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