Theorem mat1comp 22423

Description: The components of the identity matrix (as operation in maps-to notation). (Contributed by AV, 22-Jul-2019.)

Hypotheses

Ref	Expression
mamumat1cl.b	⊢ 𝐵 = (Base‘𝑅)
mamumat1cl.r	⊢ (𝜑 → 𝑅 ∈ Ring)
mamumat1cl.o	⊢ 1 = (1r‘𝑅)
mamumat1cl.z	⊢ 0 = (0g‘𝑅)
mamumat1cl.i	⊢ 𝐼 = (𝑖 ∈ 𝑀, 𝑗 ∈ 𝑀 ↦ if(𝑖 = 𝑗, 1 , 0 ))
mamumat1cl.m	⊢ (𝜑 → 𝑀 ∈ Fin)

Assertion

Ref	Expression
mat1comp	⊢ ((𝐴 ∈ 𝑀 ∧ 𝐽 ∈ 𝑀) → (𝐴𝐼𝐽) = if(𝐴 = 𝐽, 1 , 0 ))

Distinct variable groups:   𝑖,𝑗,𝐵   𝑖,𝑀,𝑗   𝜑,𝑖,𝑗   𝐴,𝑖,𝑗   𝑖,𝐽,𝑗   0 ,𝑖,𝑗   1 ,𝑖,𝑗

Allowed substitution hints:   𝑅(𝑖,𝑗)   𝐼(𝑖,𝑗)

Proof of Theorem mat1comp

Step	Hyp	Ref	Expression
1		eqeq1 2743	. . 3 ⊢ (𝑖 = 𝐴 → (𝑖 = 𝑗 ↔ 𝐴 = 𝑗))
2	1	ifbid 4478	. 2 ⊢ (𝑖 = 𝐴 → if(𝑖 = 𝑗, 1 , 0 ) = if(𝐴 = 𝑗, 1 , 0 ))
3		eqeq2 2751	. . 3 ⊢ (𝑗 = 𝐽 → (𝐴 = 𝑗 ↔ 𝐴 = 𝐽))
4	3	ifbid 4478	. 2 ⊢ (𝑗 = 𝐽 → if(𝐴 = 𝑗, 1 , 0 ) = if(𝐴 = 𝐽, 1 , 0 ))
5		mamumat1cl.i	. 2 ⊢ 𝐼 = (𝑖 ∈ 𝑀, 𝑗 ∈ 𝑀 ↦ if(𝑖 = 𝑗, 1 , 0 ))
6		mamumat1cl.o	. . . 4 ⊢ 1 = (1r‘𝑅)
7	6	fvexi 6841	. . 3 ⊢ 1 ∈ V
8		mamumat1cl.z	. . . 4 ⊢ 0 = (0g‘𝑅)
9	8	fvexi 6841	. . 3 ⊢ 0 ∈ V
10	7, 9	ifex 4505	. 2 ⊢ if(𝐴 = 𝐽, 1 , 0 ) ∈ V
11	2, 4, 5, 10	ovmpo 7516	1 ⊢ ((𝐴 ∈ 𝑀 ∧ 𝐽 ∈ 𝑀) → (𝐴𝐼𝐽) = if(𝐴 = 𝐽, 1 , 0 ))

Syntax hints:   → wi 4   ∧ wa 396   = wceq 1547   ∈ wcel 2119  ifcif 4454  ‘cfv 6485  (class class class)co 7356   ∈ cmpo 7358  Fincfn 8883  Basecbs 17170  0_gc0g 17393  1_rcur 20153  Ringcrg 20205

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2711  ax-sep 5218  ax-nul 5228  ax-pr 5362

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2718  df-cleq 2731  df-clel 2814  df-nfc 2888  df-ne 2935  df-ral 3054  df-rex 3064  df-rab 3392  df-v 3433  df-sbc 3724  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-uni 4839  df-br 5073  df-opab 5135  df-id 5513  df-xp 5624  df-rel 5625  df-cnv 5626  df-co 5627  df-dm 5628  df-iota 6441  df-fun 6487  df-fv 6493  df-ov 7359  df-oprab 7360  df-mpo 7361

This theorem is referenced by:  mamulid  22424  mamurid  22425