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Theorem matecl 21033

Description: Each entry (according to Wikipedia "Matrix (mathematics)", 30-Dec-2018, https://en.wikipedia.org/wiki/Matrix_(mathematics)#Definition (or element or component or coefficient or cell) of a matrix is an element of the underlying ring. (Contributed by AV, 16-Dec-2018.)

**Hypotheses**
Ref	Expression
matecl.a	⊢ 𝐴 = (𝑁 Mat 𝑅)
matecl.k	⊢ 𝐾 = (Base‘𝑅)

**Assertion**
Ref	Expression
matecl	⊢ ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁 ∧ 𝑀 ∈ (Base‘𝐴)) → (𝐼𝑀𝐽) ∈ 𝐾)

Proof of Theorem matecl Dummy variables 𝑖 𝑗 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		matecl.a	. . . 4 ⊢ 𝐴 = (𝑁 Mat 𝑅)
2		eqid 2821	. . . 4 ⊢ (Base‘𝐴) = (Base‘𝐴)
3	1, 2	matrcl 21020	. . 3 ⊢ (𝑀 ∈ (Base‘𝐴) → (𝑁 ∈ Fin ∧ 𝑅 ∈ V))
4	3	3ad2ant3 1131	. 2 ⊢ ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁 ∧ 𝑀 ∈ (Base‘𝐴)) → (𝑁 ∈ Fin ∧ 𝑅 ∈ V))
5		matecl.k	. . . . . . . . 9 ⊢ 𝐾 = (Base‘𝑅)
6	1, 5	matbas2 21029	. . . . . . . 8 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (𝐾 ↑_m (𝑁 × 𝑁)) = (Base‘𝐴))
7	6	eqcomd 2827	. . . . . . 7 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (Base‘𝐴) = (𝐾 ↑_m (𝑁 × 𝑁)))
8	7	eleq2d 2898	. . . . . 6 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (𝑀 ∈ (Base‘𝐴) ↔ 𝑀 ∈ (𝐾 ↑_m (𝑁 × 𝑁))))
9	5	fvexi 6683	. . . . . . . . 9 ⊢ 𝐾 ∈ V
10	9	a1i 11	. . . . . . . 8 ⊢ (𝑅 ∈ V → 𝐾 ∈ V)
11		sqxpexg 7476	. . . . . . . 8 ⊢ (𝑁 ∈ Fin → (𝑁 × 𝑁) ∈ V)
12		elmapg 8418	. . . . . . . 8 ⊢ ((𝐾 ∈ V ∧ (𝑁 × 𝑁) ∈ V) → (𝑀 ∈ (𝐾 ↑_m (𝑁 × 𝑁)) ↔ 𝑀:(𝑁 × 𝑁)⟶𝐾))
13	10, 11, 12	syl2anr 598	. . . . . . 7 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (𝑀 ∈ (𝐾 ↑_m (𝑁 × 𝑁)) ↔ 𝑀:(𝑁 × 𝑁)⟶𝐾))
14		ffnov 7277	. . . . . . . 8 ⊢ (𝑀:(𝑁 × 𝑁)⟶𝐾 ↔ (𝑀 Fn (𝑁 × 𝑁) ∧ ∀𝑖 ∈ 𝑁 ∀𝑗 ∈ 𝑁 (𝑖𝑀𝑗) ∈ 𝐾))
15		oveq1 7162	. . . . . . . . . . . . 13 ⊢ (𝑖 = 𝐼 → (𝑖𝑀𝑗) = (𝐼𝑀𝑗))
16	15	eleq1d 2897	. . . . . . . . . . . 12 ⊢ (𝑖 = 𝐼 → ((𝑖𝑀𝑗) ∈ 𝐾 ↔ (𝐼𝑀𝑗) ∈ 𝐾))
17		oveq2 7163	. . . . . . . . . . . . 13 ⊢ (𝑗 = 𝐽 → (𝐼𝑀𝑗) = (𝐼𝑀𝐽))
18	17	eleq1d 2897	. . . . . . . . . . . 12 ⊢ (𝑗 = 𝐽 → ((𝐼𝑀𝑗) ∈ 𝐾 ↔ (𝐼𝑀𝐽) ∈ 𝐾))
19	16, 18	rspc2v 3632	. . . . . . . . . . 11 ⊢ ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁) → (∀𝑖 ∈ 𝑁 ∀𝑗 ∈ 𝑁 (𝑖𝑀𝑗) ∈ 𝐾 → (𝐼𝑀𝐽) ∈ 𝐾))
20	19	com12 32	. . . . . . . . . 10 ⊢ (∀𝑖 ∈ 𝑁 ∀𝑗 ∈ 𝑁 (𝑖𝑀𝑗) ∈ 𝐾 → ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁) → (𝐼𝑀𝐽) ∈ 𝐾))
21	20	adantl 484	. . . . . . . . 9 ⊢ ((𝑀 Fn (𝑁 × 𝑁) ∧ ∀𝑖 ∈ 𝑁 ∀𝑗 ∈ 𝑁 (𝑖𝑀𝑗) ∈ 𝐾) → ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁) → (𝐼𝑀𝐽) ∈ 𝐾))
22	21	a1i 11	. . . . . . . 8 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → ((𝑀 Fn (𝑁 × 𝑁) ∧ ∀𝑖 ∈ 𝑁 ∀𝑗 ∈ 𝑁 (𝑖𝑀𝑗) ∈ 𝐾) → ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁) → (𝐼𝑀𝐽) ∈ 𝐾)))
23	14, 22	syl5bi 244	. . . . . . 7 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (𝑀:(𝑁 × 𝑁)⟶𝐾 → ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁) → (𝐼𝑀𝐽) ∈ 𝐾)))
24	13, 23	sylbid 242	. . . . . 6 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (𝑀 ∈ (𝐾 ↑_m (𝑁 × 𝑁)) → ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁) → (𝐼𝑀𝐽) ∈ 𝐾)))
25	8, 24	sylbid 242	. . . . 5 ⊢ ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (𝑀 ∈ (Base‘𝐴) → ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁) → (𝐼𝑀𝐽) ∈ 𝐾)))
26	25	com13 88	. . . 4 ⊢ ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁) → (𝑀 ∈ (Base‘𝐴) → ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (𝐼𝑀𝐽) ∈ 𝐾)))
27	26	ex 415	. . 3 ⊢ (𝐼 ∈ 𝑁 → (𝐽 ∈ 𝑁 → (𝑀 ∈ (Base‘𝐴) → ((𝑁 ∈ Fin ∧ 𝑅 ∈ V) → (𝐼𝑀𝐽) ∈ 𝐾))))
28	27	3imp1 1343	. 2 ⊢ (((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁 ∧ 𝑀 ∈ (Base‘𝐴)) ∧ (𝑁 ∈ Fin ∧ 𝑅 ∈ V)) → (𝐼𝑀𝐽) ∈ 𝐾)
29	4, 28	mpdan 685	1 ⊢ ((𝐼 ∈ 𝑁 ∧ 𝐽 ∈ 𝑁 ∧ 𝑀 ∈ (Base‘𝐴)) → (𝐼𝑀𝐽) ∈ 𝐾)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∧ w3a 1083 = wceq 1533 ∈ wcel 2110 ∀wral 3138 Vcvv 3494 × cxp 5552 Fn wfn 6349 ⟶wf 6350 ‘cfv 6354 (class class class)co 7155 ↑_m cmap 8405 Fincfn 8508 Basecbs 16482 Mat cmat 21015

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-rep 5189 ax-sep 5202 ax-nul 5209 ax-pow 5265 ax-pr 5329 ax-un 7460 ax-cnex 10592 ax-resscn 10593 ax-1cn 10594 ax-icn 10595 ax-addcl 10596 ax-addrcl 10597 ax-mulcl 10598 ax-mulrcl 10599 ax-mulcom 10600 ax-addass 10601 ax-mulass 10602 ax-distr 10603 ax-i2m1 10604 ax-1ne0 10605 ax-1rid 10606 ax-rnegex 10607 ax-rrecex 10608 ax-cnre 10609 ax-pre-lttri 10610 ax-pre-lttrn 10611 ax-pre-ltadd 10612 ax-pre-mulgt0 10613

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3772 df-csb 3883 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-pss 3953 df-nul 4291 df-if 4467 df-pw 4540 df-sn 4567 df-pr 4569 df-tp 4571 df-op 4573 df-ot 4575 df-uni 4838 df-int 4876 df-iun 4920 df-br 5066 df-opab 5128 df-mpt 5146 df-tr 5172 df-id 5459 df-eprel 5464 df-po 5473 df-so 5474 df-fr 5513 df-we 5515 df-xp 5560 df-rel 5561 df-cnv 5562 df-co 5563 df-dm 5564 df-rn 5565 df-res 5566 df-ima 5567 df-pred 6147 df-ord 6193 df-on 6194 df-lim 6195 df-suc 6196 df-iota 6313 df-fun 6356 df-fn 6357 df-f 6358 df-f1 6359 df-fo 6360 df-f1o 6361 df-fv 6362 df-riota 7113 df-ov 7158 df-oprab 7159 df-mpo 7160 df-om 7580 df-1st 7688 df-2nd 7689 df-supp 7830 df-wrecs 7946 df-recs 8007 df-rdg 8045 df-1o 8101 df-oadd 8105 df-er 8288 df-map 8407 df-ixp 8461 df-en 8509 df-dom 8510 df-sdom 8511 df-fin 8512 df-fsupp 8833 df-sup 8905 df-pnf 10676 df-mnf 10677 df-xr 10678 df-ltxr 10679 df-le 10680 df-sub 10871 df-neg 10872 df-nn 11638 df-2 11699 df-3 11700 df-4 11701 df-5 11702 df-6 11703 df-7 11704 df-8 11705 df-9 11706 df-n0 11897 df-z 11981 df-dec 12098 df-uz 12243 df-fz 12892 df-struct 16484 df-ndx 16485 df-slot 16486 df-base 16488 df-sets 16489 df-ress 16490 df-plusg 16577 df-mulr 16578 df-sca 16580 df-vsca 16581 df-ip 16582 df-tset 16583 df-ple 16584 df-ds 16586 df-hom 16588 df-cco 16589 df-0g 16714 df-prds 16720 df-pws 16722 df-sra 19943 df-rgmod 19944 df-dsmm 20875 df-frlm 20890 df-mat 21016

This theorem is referenced by: matecld 21034 matinvgcell 21043 matepmcl 21070 matepm2cl 21071 dmatmul 21105 marrepcl 21172 marepvcl 21177 mulmarep1el 21180 mulmarep1gsum1 21181 submabas 21186 m1detdiag 21205 mdetdiag 21207 m2detleib 21239 marep01ma 21268 smadiadetlem4 21277 mat2pmatbas 21333 decpmatmul 21379 pm2mpghm 21423 chpscmat 21449 chpscmatgsumbin 21451 chpscmatgsummon 21452 mdetlap1 31091

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