slesolvec - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > slesolvec		Structured version Visualization version GIF version

Theorem slesolvec 22572

Description: Every solution of a system of linear equations represented by a matrix and a vector is a vector. (Contributed by AV, 10-Feb-2019.) (Revised by AV, 27-Feb-2019.)

**Hypotheses**
Ref	Expression
slesolex.a	⊢ 𝐴 = (𝑁 Mat 𝑅)
slesolex.b	⊢ 𝐵 = (Base‘𝐴)
slesolex.v	⊢ 𝑉 = ((Base‘𝑅) ↑_m 𝑁)
slesolex.x	⊢ · = (𝑅 maVecMul ⟨𝑁, 𝑁⟩)

**Assertion**
Ref	Expression
slesolvec	⊢ (((𝑁 ≠ ∅ ∧ 𝑅 ∈ Ring) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉)) → ((𝑋 · 𝑍) = 𝑌 → 𝑍 ∈ 𝑉))

**Proof of Theorem slesolvec**
Step	Hyp	Ref	Expression
1		slesolex.a	. . . . . . 7 ⊢ 𝐴 = (𝑁 Mat 𝑅)
2		slesolex.b	. . . . . . 7 ⊢ 𝐵 = (Base‘𝐴)
3	1, 2	matrcl 22305	. . . . . 6 ⊢ (𝑋 ∈ 𝐵 → (𝑁 ∈ Fin ∧ 𝑅 ∈ V))
4	3	simpld 494	. . . . 5 ⊢ (𝑋 ∈ 𝐵 → 𝑁 ∈ Fin)
5		simpr 484	. . . . . . . 8 ⊢ ((𝑁 ≠ ∅ ∧ 𝑁 ∈ Fin) → 𝑁 ∈ Fin)
6		simpl 482	. . . . . . . 8 ⊢ ((𝑁 ≠ ∅ ∧ 𝑁 ∈ Fin) → 𝑁 ≠ ∅)
7	5, 5, 6	3jca 1128	. . . . . . 7 ⊢ ((𝑁 ≠ ∅ ∧ 𝑁 ∈ Fin) → (𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅))
8	7	ex 412	. . . . . 6 ⊢ (𝑁 ≠ ∅ → (𝑁 ∈ Fin → (𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅)))
9	8	adantr 480	. . . . 5 ⊢ ((𝑁 ≠ ∅ ∧ 𝑅 ∈ Ring) → (𝑁 ∈ Fin → (𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅)))
10	4, 9	syl5com 31	. . . 4 ⊢ (𝑋 ∈ 𝐵 → ((𝑁 ≠ ∅ ∧ 𝑅 ∈ Ring) → (𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅)))
11	10	adantr 480	. . 3 ⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) → ((𝑁 ≠ ∅ ∧ 𝑅 ∈ Ring) → (𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅)))
12	11	impcom 407	. 2 ⊢ (((𝑁 ≠ ∅ ∧ 𝑅 ∈ Ring) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉)) → (𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅))
13		simpr 484	. . 3 ⊢ ((𝑁 ≠ ∅ ∧ 𝑅 ∈ Ring) → 𝑅 ∈ Ring)
14		simpr 484	. . 3 ⊢ ((𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉) → 𝑌 ∈ 𝑉)
15	13, 14	anim12i 613	. 2 ⊢ (((𝑁 ≠ ∅ ∧ 𝑅 ∈ Ring) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉)) → (𝑅 ∈ Ring ∧ 𝑌 ∈ 𝑉))
16		eqid 2730	. . 3 ⊢ (Base‘𝑅) = (Base‘𝑅)
17		eqid 2730	. . 3 ⊢ ((Base‘𝑅) ↑_m (𝑁 × 𝑁)) = ((Base‘𝑅) ↑_m (𝑁 × 𝑁))
18		slesolex.v	. . 3 ⊢ 𝑉 = ((Base‘𝑅) ↑_m 𝑁)
19		slesolex.x	. . 3 ⊢ · = (𝑅 maVecMul ⟨𝑁, 𝑁⟩)
20	16, 17, 18, 19, 18	mavmulsolcl 22444	. 2 ⊢ (((𝑁 ∈ Fin ∧ 𝑁 ∈ Fin ∧ 𝑁 ≠ ∅) ∧ (𝑅 ∈ Ring ∧ 𝑌 ∈ 𝑉)) → ((𝑋 · 𝑍) = 𝑌 → 𝑍 ∈ 𝑉))
21	12, 15, 20	syl2anc 584	1 ⊢ (((𝑁 ≠ ∅ ∧ 𝑅 ∈ Ring) ∧ (𝑋 ∈ 𝐵 ∧ 𝑌 ∈ 𝑉)) → ((𝑋 · 𝑍) = 𝑌 → 𝑍 ∈ 𝑉))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2109 ≠ wne 2926 Vcvv 3450 ∅c0 4298 ⟨cop 4597 × cxp 5638 ‘cfv 6513 (class class class)co 7389 ↑_m cmap 8801 Fincfn 8920 Basecbs 17185 Ringcrg 20148 Mat cmat 22300 maVecMul cmvmul 22433

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 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-rep 5236 ax-sep 5253 ax-nul 5263 ax-pow 5322 ax-pr 5389 ax-un 7713 ax-cnex 11130 ax-1cn 11132 ax-addcl 11134

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3756 df-csb 3865 df-dif 3919 df-un 3921 df-in 3923 df-ss 3933 df-pss 3936 df-nul 4299 df-if 4491 df-pw 4567 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-iun 4959 df-br 5110 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5535 df-eprel 5540 df-po 5548 df-so 5549 df-fr 5593 df-we 5595 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-pred 6276 df-ord 6337 df-on 6338 df-lim 6339 df-suc 6340 df-iota 6466 df-fun 6515 df-fn 6516 df-f 6517 df-f1 6518 df-fo 6519 df-f1o 6520 df-fv 6521 df-ov 7392 df-oprab 7393 df-mpo 7394 df-om 7845 df-1st 7970 df-2nd 7971 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8380 df-map 8803 df-nn 12188 df-slot 17158 df-ndx 17170 df-base 17186 df-mat 22301 df-mvmul 22434

This theorem is referenced by: slesolinv 22573 cramerimplem3 22578 cramerimp 22579 cramer 22584

W3C validator