uvcvv0 - Metamath Proof Explorer

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Theorem uvcvv0 21977

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 2766	. . . 4 ⊢ (1_r‘𝑅) = (1_r‘𝑅)
7		uvcvv0.z	. . . 4 ⊢ 0 = (0_g‘𝑅)
8	5, 6, 7	uvcvval 21973	. . 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 3017	. . . 4 ⊢ (𝐽 ≠ 𝐾 ↔ ¬ 𝐾 = 𝐽)
12	10, 11	sylib 221	. . 3 ⊢ (𝜑 → ¬ 𝐾 = 𝐽)
13	12	iffalsed 4503	. 2 ⊢ (𝜑 → if(𝐾 = 𝐽, (1_r‘𝑅), 0 ) = 0 )
14	9, 13	eqtrd 2801	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 2146 ≠ wne 2961 ifcif 4492 ‘cfv 6543 (class class class)co 7423 0_gc0g 17517 1_rcur 20294 unitVec cuvc 21969

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 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2738 ax-rep 5243 ax-sep 5262 ax-nul 5274 ax-pr 5409

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 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ne 2962 df-ral 3083 df-rex 3093 df-reu 3373 df-rab 3420 df-v 3460 df-sbc 3748 df-csb 3857 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-id 5561 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-iota 6499 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-ov 7426 df-oprab 7427 df-mpo 7428 df-uvc 21970

This theorem is used by: uvcf1 21979 uvcresum 21980 frlmssuvc1 21981 frlmsslsp 21983 frlmup2 21986

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