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Theorem marepvfval 20589
Description: First substitution for the definition of the function replacing a column of a matrix by a vector. (Contributed by AV, 14-Feb-2019.) (Revised by AV, 26-Feb-2019.)
Hypotheses
Ref Expression
marepvfval.a 𝐴 = (𝑁 Mat 𝑅)
marepvfval.b 𝐵 = (Base‘𝐴)
marepvfval.q 𝑄 = (𝑁 matRepV 𝑅)
marepvfval.v 𝑉 = ((Base‘𝑅) ↑𝑚 𝑁)
Assertion
Ref Expression
marepvfval 𝑄 = (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗)))))
Distinct variable groups:   𝐵,𝑚,𝑣   𝑖,𝑁,𝑗,𝑘,𝑚,𝑣   𝑅,𝑖,𝑗,𝑘,𝑚,𝑣   𝑚,𝑉,𝑣
Allowed substitution hints:   𝐴(𝑣,𝑖,𝑗,𝑘,𝑚)   𝐵(𝑖,𝑗,𝑘)   𝑄(𝑣,𝑖,𝑗,𝑘,𝑚)   𝑉(𝑖,𝑗,𝑘)

Proof of Theorem marepvfval
Dummy variables 𝑛 𝑟 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 marepvfval.q . 2 𝑄 = (𝑁 matRepV 𝑅)
2 marepvfval.b . . . . . 6 𝐵 = (Base‘𝐴)
32fvexi 6345 . . . . 5 𝐵 ∈ V
4 marepvfval.v . . . . . . 7 𝑉 = ((Base‘𝑅) ↑𝑚 𝑁)
5 ovex 6827 . . . . . . 7 ((Base‘𝑅) ↑𝑚 𝑁) ∈ V
64, 5eqeltri 2846 . . . . . 6 𝑉 ∈ V
76a1i 11 . . . . 5 ((𝑁 ∈ V ∧ 𝑅 ∈ V) → 𝑉 ∈ V)
8 mpt2exga 7400 . . . . 5 ((𝐵 ∈ V ∧ 𝑉 ∈ V) → (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))) ∈ V)
93, 7, 8sylancr 575 . . . 4 ((𝑁 ∈ V ∧ 𝑅 ∈ V) → (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))) ∈ V)
10 oveq12 6805 . . . . . . . . 9 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑛 Mat 𝑟) = (𝑁 Mat 𝑅))
11 marepvfval.a . . . . . . . . 9 𝐴 = (𝑁 Mat 𝑅)
1210, 11syl6eqr 2823 . . . . . . . 8 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑛 Mat 𝑟) = 𝐴)
1312fveq2d 6337 . . . . . . 7 ((𝑛 = 𝑁𝑟 = 𝑅) → (Base‘(𝑛 Mat 𝑟)) = (Base‘𝐴))
1413, 2syl6eqr 2823 . . . . . 6 ((𝑛 = 𝑁𝑟 = 𝑅) → (Base‘(𝑛 Mat 𝑟)) = 𝐵)
15 fveq2 6333 . . . . . . . . 9 (𝑟 = 𝑅 → (Base‘𝑟) = (Base‘𝑅))
1615adantl 467 . . . . . . . 8 ((𝑛 = 𝑁𝑟 = 𝑅) → (Base‘𝑟) = (Base‘𝑅))
17 simpl 468 . . . . . . . 8 ((𝑛 = 𝑁𝑟 = 𝑅) → 𝑛 = 𝑁)
1816, 17oveq12d 6814 . . . . . . 7 ((𝑛 = 𝑁𝑟 = 𝑅) → ((Base‘𝑟) ↑𝑚 𝑛) = ((Base‘𝑅) ↑𝑚 𝑁))
1918, 4syl6eqr 2823 . . . . . 6 ((𝑛 = 𝑁𝑟 = 𝑅) → ((Base‘𝑟) ↑𝑚 𝑛) = 𝑉)
20 eqidd 2772 . . . . . . . 8 ((𝑛 = 𝑁𝑟 = 𝑅) → if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗)) = if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗)))
2117, 17, 20mpt2eq123dv 6868 . . . . . . 7 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑖𝑛, 𝑗𝑛 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))) = (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))
2217, 21mpteq12dv 4868 . . . . . 6 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑘𝑛 ↦ (𝑖𝑛, 𝑗𝑛 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗)))) = (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗)))))
2314, 19, 22mpt2eq123dv 6868 . . . . 5 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑚 ∈ (Base‘(𝑛 Mat 𝑟)), 𝑣 ∈ ((Base‘𝑟) ↑𝑚 𝑛) ↦ (𝑘𝑛 ↦ (𝑖𝑛, 𝑗𝑛 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))) = (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))))
24 df-marepv 20583 . . . . 5 matRepV = (𝑛 ∈ V, 𝑟 ∈ V ↦ (𝑚 ∈ (Base‘(𝑛 Mat 𝑟)), 𝑣 ∈ ((Base‘𝑟) ↑𝑚 𝑛) ↦ (𝑘𝑛 ↦ (𝑖𝑛, 𝑗𝑛 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))))
2523, 24ovmpt2ga 6941 . . . 4 ((𝑁 ∈ V ∧ 𝑅 ∈ V ∧ (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))) ∈ V) → (𝑁 matRepV 𝑅) = (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))))
269, 25mpd3an3 1573 . . 3 ((𝑁 ∈ V ∧ 𝑅 ∈ V) → (𝑁 matRepV 𝑅) = (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))))
2724mpt2ndm0 7026 . . . . 5 (¬ (𝑁 ∈ V ∧ 𝑅 ∈ V) → (𝑁 matRepV 𝑅) = ∅)
28 mpt20 6876 . . . . 5 (𝑚 ∈ ∅, 𝑣 ∈ ((Base‘𝑅) ↑𝑚 𝑁) ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))) = ∅
2927, 28syl6eqr 2823 . . . 4 (¬ (𝑁 ∈ V ∧ 𝑅 ∈ V) → (𝑁 matRepV 𝑅) = (𝑚 ∈ ∅, 𝑣 ∈ ((Base‘𝑅) ↑𝑚 𝑁) ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))))
3011fveq2i 6336 . . . . . . 7 (Base‘𝐴) = (Base‘(𝑁 Mat 𝑅))
312, 30eqtri 2793 . . . . . 6 𝐵 = (Base‘(𝑁 Mat 𝑅))
32 matbas0pc 20432 . . . . . 6 (¬ (𝑁 ∈ V ∧ 𝑅 ∈ V) → (Base‘(𝑁 Mat 𝑅)) = ∅)
3331, 32syl5eq 2817 . . . . 5 (¬ (𝑁 ∈ V ∧ 𝑅 ∈ V) → 𝐵 = ∅)
34 mpt2eq12 6866 . . . . 5 ((𝐵 = ∅ ∧ 𝑉 = ((Base‘𝑅) ↑𝑚 𝑁)) → (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))) = (𝑚 ∈ ∅, 𝑣 ∈ ((Base‘𝑅) ↑𝑚 𝑁) ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))))
3533, 4, 34sylancl 574 . . . 4 (¬ (𝑁 ∈ V ∧ 𝑅 ∈ V) → (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))) = (𝑚 ∈ ∅, 𝑣 ∈ ((Base‘𝑅) ↑𝑚 𝑁) ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))))
3629, 35eqtr4d 2808 . . 3 (¬ (𝑁 ∈ V ∧ 𝑅 ∈ V) → (𝑁 matRepV 𝑅) = (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗))))))
3726, 36pm2.61i 176 . 2 (𝑁 matRepV 𝑅) = (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗)))))
381, 37eqtri 2793 1 𝑄 = (𝑚𝐵, 𝑣𝑉 ↦ (𝑘𝑁 ↦ (𝑖𝑁, 𝑗𝑁 ↦ if(𝑗 = 𝑘, (𝑣𝑖), (𝑖𝑚𝑗)))))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wa 382   = wceq 1631  wcel 2145  Vcvv 3351  c0 4063  ifcif 4226  cmpt 4864  cfv 6030  (class class class)co 6796  cmpt2 6798  𝑚 cmap 8013  Basecbs 16064   Mat cmat 20430   matRepV cmatrepV 20581
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-8 2147  ax-9 2154  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408  ax-ext 2751  ax-rep 4905  ax-sep 4916  ax-nul 4924  ax-pow 4975  ax-pr 5035  ax-un 7100
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 837  df-3an 1073  df-tru 1634  df-ex 1853  df-nf 1858  df-sb 2050  df-eu 2622  df-mo 2623  df-clab 2758  df-cleq 2764  df-clel 2767  df-nfc 2902  df-ne 2944  df-ral 3066  df-rex 3067  df-reu 3068  df-rab 3070  df-v 3353  df-sbc 3588  df-csb 3683  df-dif 3726  df-un 3728  df-in 3730  df-ss 3737  df-nul 4064  df-if 4227  df-pw 4300  df-sn 4318  df-pr 4320  df-op 4324  df-uni 4576  df-iun 4657  df-br 4788  df-opab 4848  df-mpt 4865  df-id 5158  df-xp 5256  df-rel 5257  df-cnv 5258  df-co 5259  df-dm 5260  df-rn 5261  df-res 5262  df-ima 5263  df-iota 5993  df-fun 6032  df-fn 6033  df-f 6034  df-f1 6035  df-fo 6036  df-f1o 6037  df-fv 6038  df-ov 6799  df-oprab 6800  df-mpt2 6801  df-1st 7319  df-2nd 7320  df-slot 16068  df-base 16070  df-mat 20431  df-marepv 20583
This theorem is referenced by:  marepvval0  20590
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