Theorem uvcvval 20932

Description: Value of a unit vector coordinate in a free module. (Contributed by Stefan O'Rear, 3-Feb-2015.)

Hypotheses

Ref	Expression
uvcfval.u	⊢ 𝑈 = (𝑅 unitVec 𝐼)
uvcfval.o	⊢ 1 = (1r‘𝑅)
uvcfval.z	⊢ 0 = (0g‘𝑅)

Assertion

Ref	Expression
uvcvval	⊢ (((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊 ∧ 𝐽 ∈ 𝐼) ∧ 𝐾 ∈ 𝐼) → ((𝑈‘𝐽)‘𝐾) = if(𝐾 = 𝐽, 1 , 0 ))

Proof of Theorem uvcvval

Dummy variable 𝑘 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		uvcfval.u	. . . . 5 ⊢ 𝑈 = (𝑅 unitVec 𝐼)
2		uvcfval.o	. . . . 5 ⊢ 1 = (1r‘𝑅)
3		uvcfval.z	. . . . 5 ⊢ 0 = (0g‘𝑅)
4	1, 2, 3	uvcval 20931	. . . 4 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊 ∧ 𝐽 ∈ 𝐼) → (𝑈‘𝐽) = (𝑘 ∈ 𝐼 ↦ if(𝑘 = 𝐽, 1 , 0 )))
5	4	fveq1d 6674	. . 3 ⊢ ((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊 ∧ 𝐽 ∈ 𝐼) → ((𝑈‘𝐽)‘𝐾) = ((𝑘 ∈ 𝐼 ↦ if(𝑘 = 𝐽, 1 , 0 ))‘𝐾))
6	5	adantr 483	. 2 ⊢ (((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊 ∧ 𝐽 ∈ 𝐼) ∧ 𝐾 ∈ 𝐼) → ((𝑈‘𝐽)‘𝐾) = ((𝑘 ∈ 𝐼 ↦ if(𝑘 = 𝐽, 1 , 0 ))‘𝐾))
7		simpr 487	. . 3 ⊢ (((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊 ∧ 𝐽 ∈ 𝐼) ∧ 𝐾 ∈ 𝐼) → 𝐾 ∈ 𝐼)
8	2	fvexi 6686	. . . 4 ⊢ 1 ∈ V
9	3	fvexi 6686	. . . 4 ⊢ 0 ∈ V
10	8, 9	ifex 4517	. . 3 ⊢ if(𝐾 = 𝐽, 1 , 0 ) ∈ V
11		eqeq1 2827	. . . . 5 ⊢ (𝑘 = 𝐾 → (𝑘 = 𝐽 ↔ 𝐾 = 𝐽))
12	11	ifbid 4491	. . . 4 ⊢ (𝑘 = 𝐾 → if(𝑘 = 𝐽, 1 , 0 ) = if(𝐾 = 𝐽, 1 , 0 ))
13		eqid 2823	. . . 4 ⊢ (𝑘 ∈ 𝐼 ↦ if(𝑘 = 𝐽, 1 , 0 )) = (𝑘 ∈ 𝐼 ↦ if(𝑘 = 𝐽, 1 , 0 ))
14	12, 13	fvmptg 6768	. . 3 ⊢ ((𝐾 ∈ 𝐼 ∧ if(𝐾 = 𝐽, 1 , 0 ) ∈ V) → ((𝑘 ∈ 𝐼 ↦ if(𝑘 = 𝐽, 1 , 0 ))‘𝐾) = if(𝐾 = 𝐽, 1 , 0 ))
15	7, 10, 14	sylancl 588	. 2 ⊢ (((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊 ∧ 𝐽 ∈ 𝐼) ∧ 𝐾 ∈ 𝐼) → ((𝑘 ∈ 𝐼 ↦ if(𝑘 = 𝐽, 1 , 0 ))‘𝐾) = if(𝐾 = 𝐽, 1 , 0 ))
16	6, 15	eqtrd 2858	1 ⊢ (((𝑅 ∈ 𝑉 ∧ 𝐼 ∈ 𝑊 ∧ 𝐽 ∈ 𝐼) ∧ 𝐾 ∈ 𝐼) → ((𝑈‘𝐽)‘𝐾) = if(𝐾 = 𝐽, 1 , 0 ))

Syntax hints:   → wi 4   ∧ wa 398   ∧ w3a 1083   = wceq 1537   ∈ wcel 2114  Vcvv 3496  ifcif 4469   ↦ cmpt 5148  ‘cfv 6357  (class class class)co 7158  0_gc0g 16715  1_rcur 19253   unitVec cuvc 20928

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-rep 5192  ax-sep 5205  ax-nul 5212  ax-pr 5332

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-ral 3145  df-rex 3146  df-reu 3147  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fo 6363  df-f1o 6364  df-fv 6365  df-ov 7161  df-oprab 7162  df-mpo 7163  df-uvc 20929

This theorem is referenced by:  uvcvvcl  20933  uvcvvcl2  20934  uvcvv1  20935  uvcvv0  20936  matunitlindflem2  34891