uvcvv0 - Metamath Proof Explorer

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Theorem uvcvv0 22076

Description: The unit vector is zero at its designated coordinate. (Contributed by Stefan O'Rear, 3-Feb-2015.)

**Hypotheses**
Ref	Expression
uvcvv.u	⊢ 𝑈 = (𝑅 unitVec 𝐼)
uvcvv.r	⊢ (𝜑 → 𝑅 ∈ 𝑉)
uvcvv.i	⊢ (𝜑 → 𝐼 ∈ 𝑊)
uvcvv.j	⊢ (𝜑 → 𝐽 ∈ 𝐼)
uvcvv0.k	⊢ (𝜑 → 𝐾 ∈ 𝐼)
uvcvv0.jk	⊢ (𝜑 → 𝐽 ≠ 𝐾)
uvcvv0.z	⊢ 0 = (0_g‘𝑅)

**Assertion**
Ref	Expression
uvcvv0	⊢ (𝜑 → ((𝑈‘𝐽)‘𝐾) = 0 )

**Proof of Theorem uvcvv0**
Step	Hyp	Ref	Expression
1		uvcvv.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ 𝑉)
2		uvcvv.i	. . 3 ⊢ (𝜑 → 𝐼 ∈ 𝑊)
3		uvcvv.j	. . 3 ⊢ (𝜑 → 𝐽 ∈ 𝐼)
4		uvcvv0.k	. . 3 ⊢ (𝜑 → 𝐾 ∈ 𝐼)
5		uvcvv.u	. . . 4 ⊢ 𝑈 = (𝑅 unitVec 𝐼)
6		eqid 2761	. . . 4 ⊢ (1_r‘𝑅) = (1_r‘𝑅)
7		uvcvv0.z	. . . 4 ⊢ 0 = (0_g‘𝑅)
8	5, 6, 7	uvcvval 22072	. . 3 ⊢ (((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊 ∧ 𝐽 ∈ 𝐼) ∧ 𝐾 ∈ 𝐼) → ((𝑈‘𝐽)‘𝐾) = if(𝐾 = 𝐽, (1_r‘𝑅), 0 ))
9	1, 2, 3, 4, 8	syl31anc 1400	. 2 ⊢ (𝜑 → ((𝑈‘𝐽)‘𝐾) = if(𝐾 = 𝐽, (1_r‘𝑅), 0 ))
10		uvcvv0.jk	. . . 4 ⊢ (𝜑 → 𝐽 ≠ 𝐾)
11		nesym 3012	. . . 4 ⊢ (𝐽 ≠ 𝐾 ↔ ¬ 𝐾 = 𝐽)
12	10, 11	sylib 221	. . 3 ⊢ (𝜑 → ¬ 𝐾 = 𝐽)
13	12	iffalsed 4493	. 2 ⊢ (𝜑 → if(𝐾 = 𝐽, (1_r‘𝑅), 0 ) = 0 )
14	9, 13	eqtrd 2796	1 ⊢ (𝜑 → ((𝑈‘𝐽)‘𝐾) = 0 )

Colors of variables: wff setvar class

This proof depends on syntax axioms: ¬ wn 3 → wi 4 = wceq 1570 ∈ wcel 2145 ≠ wne 2956 ifcif 4482 ‘cfv 6531 (class class class)co 7412 0_gc0g 17590 1_rcur 20387 unitVec cuvc 22068

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-rep 5232 ax-sep 5249 ax-nul 5260 ax-pr 5391

This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-reu 3367 df-rab 3414 df-v 3453 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-ov 7415 df-oprab 7416 df-mpo 7417 df-uvc 22069

This theorem is used by: uvcf1 22078 uvcresum 22079 frlmssuvc1 22080 frlmsslsp 22082 frlmup2 22085

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