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Theorem mdetr0 22106

Description: The determinant of a matrix with a row containing only 0's is 0. (Contributed by SO, 16-Jul-2018.)

**Hypotheses**
Ref	Expression
mdetr0.d	⊢ 𝐷 = (𝑁 maDet 𝑅)
mdetr0.k	⊢ 𝐾 = (Base‘𝑅)
mdetr0.z	⊢ 0 = (0_g‘𝑅)
mdetr0.r	⊢ (𝜑 → 𝑅 ∈ CRing)
mdetr0.n	⊢ (𝜑 → 𝑁 ∈ Fin)
mdetr0.x	⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝑋 ∈ 𝐾)
mdetr0.i	⊢ (𝜑 → 𝐼 ∈ 𝑁)

**Assertion**
Ref	Expression
mdetr0	⊢ (𝜑 → (𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋))) = 0 )

Distinct variable groups: 𝜑,𝑖,𝑗 𝑖,𝐾,𝑗 𝑖,𝑁,𝑗 𝑖,𝐼,𝑗 0 ,𝑖,𝑗 𝑅,𝑖,𝑗 Allowed substitution hints: 𝐷(𝑖,𝑗) 𝑋(𝑖,𝑗)

**Proof of Theorem mdetr0**
Step	Hyp	Ref	Expression
1		mdetr0.d	. . 3 ⊢ 𝐷 = (𝑁 maDet 𝑅)
2		mdetr0.k	. . 3 ⊢ 𝐾 = (Base‘𝑅)
3		eqid 2732	. . 3 ⊢ (._r‘𝑅) = (._r‘𝑅)
4		mdetr0.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ CRing)
5		mdetr0.n	. . 3 ⊢ (𝜑 → 𝑁 ∈ Fin)
6		crngring 20067	. . . . . 6 ⊢ (𝑅 ∈ CRing → 𝑅 ∈ Ring)
7	4, 6	syl 17	. . . . 5 ⊢ (𝜑 → 𝑅 ∈ Ring)
8		mdetr0.z	. . . . . 6 ⊢ 0 = (0_g‘𝑅)
9	2, 8	ring0cl 20083	. . . . 5 ⊢ (𝑅 ∈ Ring → 0 ∈ 𝐾)
10	7, 9	syl 17	. . . 4 ⊢ (𝜑 → 0 ∈ 𝐾)
11	10	3ad2ant1 1133	. . 3 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 0 ∈ 𝐾)
12		mdetr0.x	. . 3 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → 𝑋 ∈ 𝐾)
13		mdetr0.i	. . 3 ⊢ (𝜑 → 𝐼 ∈ 𝑁)
14	1, 2, 3, 4, 5, 11, 12, 10, 13	mdetrsca2 22105	. 2 ⊢ (𝜑 → (𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, ( 0 (._r‘𝑅) 0 ), 𝑋))) = ( 0 (._r‘𝑅)(𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋)))))
15	2, 3, 8	ringlz 20106	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 0 ∈ 𝐾) → ( 0 (._r‘𝑅) 0 ) = 0 )
16	7, 10, 15	syl2anc 584	. . . . 5 ⊢ (𝜑 → ( 0 (._r‘𝑅) 0 ) = 0 )
17	16	ifeq1d 4547	. . . 4 ⊢ (𝜑 → if(𝑖 = 𝐼, ( 0 (._r‘𝑅) 0 ), 𝑋) = if(𝑖 = 𝐼, 0 , 𝑋))
18	17	mpoeq3dv 7487	. . 3 ⊢ (𝜑 → (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, ( 0 (._r‘𝑅) 0 ), 𝑋)) = (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋)))
19	18	fveq2d 6895	. 2 ⊢ (𝜑 → (𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, ( 0 (._r‘𝑅) 0 ), 𝑋))) = (𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋))))
20		eqid 2732	. . . . . 6 ⊢ (𝑁 Mat 𝑅) = (𝑁 Mat 𝑅)
21		eqid 2732	. . . . . 6 ⊢ (Base‘(𝑁 Mat 𝑅)) = (Base‘(𝑁 Mat 𝑅))
22	1, 20, 21, 2	mdetf 22096	. . . . 5 ⊢ (𝑅 ∈ CRing → 𝐷:(Base‘(𝑁 Mat 𝑅))⟶𝐾)
23	4, 22	syl 17	. . . 4 ⊢ (𝜑 → 𝐷:(Base‘(𝑁 Mat 𝑅))⟶𝐾)
24	11, 12	ifcld 4574	. . . . 5 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝑁 ∧ 𝑗 ∈ 𝑁) → if(𝑖 = 𝐼, 0 , 𝑋) ∈ 𝐾)
25	20, 2, 21, 5, 4, 24	matbas2d 21924	. . . 4 ⊢ (𝜑 → (𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋)) ∈ (Base‘(𝑁 Mat 𝑅)))
26	23, 25	ffvelcdmd 7087	. . 3 ⊢ (𝜑 → (𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋))) ∈ 𝐾)
27	2, 3, 8	ringlz 20106	. . 3 ⊢ ((𝑅 ∈ Ring ∧ (𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋))) ∈ 𝐾) → ( 0 (._r‘𝑅)(𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋)))) = 0 )
28	7, 26, 27	syl2anc 584	. 2 ⊢ (𝜑 → ( 0 (._r‘𝑅)(𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋)))) = 0 )
29	14, 19, 28	3eqtr3d 2780	1 ⊢ (𝜑 → (𝐷‘(𝑖 ∈ 𝑁, 𝑗 ∈ 𝑁 ↦ if(𝑖 = 𝐼, 0 , 𝑋))) = 0 )

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ w3a 1087 = wceq 1541 ∈ wcel 2106 ifcif 4528 ⟶wf 6539 ‘cfv 6543 (class class class)co 7408 ∈ cmpo 7410 Fincfn 8938 Basecbs 17143 ._rcmulr 17197 0_gc0g 17384 Ringcrg 20055 CRingccrg 20056 Mat cmat 21906 maDet cmdat 22085

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5285 ax-sep 5299 ax-nul 5306 ax-pow 5363 ax-pr 5427 ax-un 7724 ax-cnex 11165 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186 ax-addf 11188 ax-mulf 11189

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-xor 1510 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3778 df-csb 3894 df-dif 3951 df-un 3953 df-in 3955 df-ss 3965 df-pss 3967 df-nul 4323 df-if 4529 df-pw 4604 df-sn 4629 df-pr 4631 df-tp 4633 df-op 4635 df-ot 4637 df-uni 4909 df-int 4951 df-iun 4999 df-iin 5000 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5574 df-eprel 5580 df-po 5588 df-so 5589 df-fr 5631 df-se 5632 df-we 5633 df-xp 5682 df-rel 5683 df-cnv 5684 df-co 5685 df-dm 5686 df-rn 5687 df-res 5688 df-ima 5689 df-pred 6300 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6495 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-isom 6552 df-riota 7364 df-ov 7411 df-oprab 7412 df-mpo 7413 df-of 7669 df-om 7855 df-1st 7974 df-2nd 7975 df-supp 8146 df-tpos 8210 df-frecs 8265 df-wrecs 8296 df-recs 8370 df-rdg 8409 df-1o 8465 df-2o 8466 df-er 8702 df-map 8821 df-pm 8822 df-ixp 8891 df-en 8939 df-dom 8940 df-sdom 8941 df-fin 8942 df-fsupp 9361 df-sup 9436 df-oi 9504 df-card 9933 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-div 11871 df-nn 12212 df-2 12274 df-3 12275 df-4 12276 df-5 12277 df-6 12278 df-7 12279 df-8 12280 df-9 12281 df-n0 12472 df-xnn0 12544 df-z 12558 df-dec 12677 df-uz 12822 df-rp 12974 df-fz 13484 df-fzo 13627 df-seq 13966 df-exp 14027 df-hash 14290 df-word 14464 df-lsw 14512 df-concat 14520 df-s1 14545 df-substr 14590 df-pfx 14620 df-splice 14699 df-reverse 14708 df-s2 14798 df-struct 17079 df-sets 17096 df-slot 17114 df-ndx 17126 df-base 17144 df-ress 17173 df-plusg 17209 df-mulr 17210 df-starv 17211 df-sca 17212 df-vsca 17213 df-ip 17214 df-tset 17215 df-ple 17216 df-ds 17218 df-unif 17219 df-hom 17220 df-cco 17221 df-0g 17386 df-gsum 17387 df-prds 17392 df-pws 17394 df-mre 17529 df-mrc 17530 df-acs 17532 df-mgm 18560 df-sgrp 18609 df-mnd 18625 df-mhm 18670 df-submnd 18671 df-efmnd 18749 df-grp 18821 df-minusg 18822 df-mulg 18950 df-subg 19002 df-ghm 19089 df-gim 19132 df-cntz 19180 df-oppg 19209 df-symg 19234 df-pmtr 19309 df-psgn 19358 df-cmn 19649 df-abl 19650 df-mgp 19987 df-ur 20004 df-ring 20057 df-cring 20058 df-oppr 20149 df-dvdsr 20170 df-unit 20171 df-invr 20201 df-dvr 20214 df-rnghom 20250 df-subrg 20316 df-drng 20358 df-sra 20784 df-rgmod 20785 df-cnfld 20944 df-zring 21017 df-zrh 21052 df-dsmm 21286 df-frlm 21301 df-mat 21907 df-mdet 22086

This theorem is referenced by: mdet0 22107 madugsum 22144 matunitlindflem1 36479

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