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Theorem pm2mpval 20419
 Description: Value of the transformation of a polynomial matrix into a polynomial over matrices. (Contributed by AV, 5-Dec-2019.)
Hypotheses
Ref Expression
pm2mpval.p 𝑃 = (Poly1𝑅)
pm2mpval.c 𝐶 = (𝑁 Mat 𝑃)
pm2mpval.b 𝐵 = (Base‘𝐶)
pm2mpval.m = ( ·𝑠𝑄)
pm2mpval.e = (.g‘(mulGrp‘𝑄))
pm2mpval.x 𝑋 = (var1𝐴)
pm2mpval.a 𝐴 = (𝑁 Mat 𝑅)
pm2mpval.q 𝑄 = (Poly1𝐴)
pm2mpval.t 𝑇 = (𝑁 pMatToMatPoly 𝑅)
Assertion
Ref Expression
pm2mpval ((𝑁 ∈ Fin ∧ 𝑅𝑉) → 𝑇 = (𝑚𝐵 ↦ (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋))))))
Distinct variable groups:   𝐵,𝑚   𝑘,𝑁,𝑚   𝑅,𝑘,𝑚   𝑚,𝑉
Allowed substitution hints:   𝐴(𝑘,𝑚)   𝐵(𝑘)   𝐶(𝑘,𝑚)   𝑃(𝑘,𝑚)   𝑄(𝑘,𝑚)   𝑇(𝑘,𝑚)   (𝑘,𝑚)   (𝑘,𝑚)   𝑉(𝑘)   𝑋(𝑘,𝑚)

Proof of Theorem pm2mpval
Dummy variables 𝑛 𝑟 𝑎 𝑞 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 pm2mpval.t . 2 𝑇 = (𝑁 pMatToMatPoly 𝑅)
2 df-pm2mp 20417 . . . 4 pMatToMatPoly = (𝑛 ∈ Fin, 𝑟 ∈ V ↦ (𝑚 ∈ (Base‘(𝑛 Mat (Poly1𝑟))) ↦ (𝑛 Mat 𝑟) / 𝑎(Poly1𝑎) / 𝑞(𝑞 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎)))))))
32a1i 11 . . 3 ((𝑁 ∈ Fin ∧ 𝑅𝑉) → pMatToMatPoly = (𝑛 ∈ Fin, 𝑟 ∈ V ↦ (𝑚 ∈ (Base‘(𝑛 Mat (Poly1𝑟))) ↦ (𝑛 Mat 𝑟) / 𝑎(Poly1𝑎) / 𝑞(𝑞 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎))))))))
4 simpl 472 . . . . . . . 8 ((𝑛 = 𝑁𝑟 = 𝑅) → 𝑛 = 𝑁)
5 fveq2 6103 . . . . . . . . 9 (𝑟 = 𝑅 → (Poly1𝑟) = (Poly1𝑅))
65adantl 481 . . . . . . . 8 ((𝑛 = 𝑁𝑟 = 𝑅) → (Poly1𝑟) = (Poly1𝑅))
74, 6oveq12d 6567 . . . . . . 7 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑛 Mat (Poly1𝑟)) = (𝑁 Mat (Poly1𝑅)))
87fveq2d 6107 . . . . . 6 ((𝑛 = 𝑁𝑟 = 𝑅) → (Base‘(𝑛 Mat (Poly1𝑟))) = (Base‘(𝑁 Mat (Poly1𝑅))))
9 pm2mpval.b . . . . . . 7 𝐵 = (Base‘𝐶)
10 pm2mpval.c . . . . . . . . 9 𝐶 = (𝑁 Mat 𝑃)
11 pm2mpval.p . . . . . . . . . 10 𝑃 = (Poly1𝑅)
1211oveq2i 6560 . . . . . . . . 9 (𝑁 Mat 𝑃) = (𝑁 Mat (Poly1𝑅))
1310, 12eqtri 2632 . . . . . . . 8 𝐶 = (𝑁 Mat (Poly1𝑅))
1413fveq2i 6106 . . . . . . 7 (Base‘𝐶) = (Base‘(𝑁 Mat (Poly1𝑅)))
159, 14eqtri 2632 . . . . . 6 𝐵 = (Base‘(𝑁 Mat (Poly1𝑅)))
168, 15syl6eqr 2662 . . . . 5 ((𝑛 = 𝑁𝑟 = 𝑅) → (Base‘(𝑛 Mat (Poly1𝑟))) = 𝐵)
1716adantl 481 . . . 4 (((𝑁 ∈ Fin ∧ 𝑅𝑉) ∧ (𝑛 = 𝑁𝑟 = 𝑅)) → (Base‘(𝑛 Mat (Poly1𝑟))) = 𝐵)
18 ovex 6577 . . . . . 6 (𝑛 Mat 𝑟) ∈ V
19 fvex 6113 . . . . . . . 8 (Poly1𝑎) ∈ V
2019a1i 11 . . . . . . 7 (𝑎 = (𝑛 Mat 𝑟) → (Poly1𝑎) ∈ V)
21 simpr 476 . . . . . . . . 9 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → 𝑞 = (Poly1𝑎))
22 fveq2 6103 . . . . . . . . . 10 (𝑎 = (𝑛 Mat 𝑟) → (Poly1𝑎) = (Poly1‘(𝑛 Mat 𝑟)))
2322adantr 480 . . . . . . . . 9 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → (Poly1𝑎) = (Poly1‘(𝑛 Mat 𝑟)))
2421, 23eqtrd 2644 . . . . . . . 8 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → 𝑞 = (Poly1‘(𝑛 Mat 𝑟)))
2524fveq2d 6107 . . . . . . . . . 10 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → ( ·𝑠𝑞) = ( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟))))
26 eqidd 2611 . . . . . . . . . 10 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → (𝑚 decompPMat 𝑘) = (𝑚 decompPMat 𝑘))
2724fveq2d 6107 . . . . . . . . . . . 12 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → (mulGrp‘𝑞) = (mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))
2827fveq2d 6107 . . . . . . . . . . 11 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → (.g‘(mulGrp‘𝑞)) = (.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟)))))
29 eqidd 2611 . . . . . . . . . . 11 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → 𝑘 = 𝑘)
30 fveq2 6103 . . . . . . . . . . . 12 (𝑎 = (𝑛 Mat 𝑟) → (var1𝑎) = (var1‘(𝑛 Mat 𝑟)))
3130adantr 480 . . . . . . . . . . 11 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → (var1𝑎) = (var1‘(𝑛 Mat 𝑟)))
3228, 29, 31oveq123d 6570 . . . . . . . . . 10 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → (𝑘(.g‘(mulGrp‘𝑞))(var1𝑎)) = (𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟))))
3325, 26, 32oveq123d 6570 . . . . . . . . 9 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎))) = ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟)))))
3433mpteq2dv 4673 . . . . . . . 8 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎)))) = (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟))))))
3524, 34oveq12d 6567 . . . . . . 7 ((𝑎 = (𝑛 Mat 𝑟) ∧ 𝑞 = (Poly1𝑎)) → (𝑞 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎))))) = ((Poly1‘(𝑛 Mat 𝑟)) Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟)))))))
3620, 35csbied 3526 . . . . . 6 (𝑎 = (𝑛 Mat 𝑟) → (Poly1𝑎) / 𝑞(𝑞 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎))))) = ((Poly1‘(𝑛 Mat 𝑟)) Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟)))))))
3718, 36csbie 3525 . . . . 5 (𝑛 Mat 𝑟) / 𝑎(Poly1𝑎) / 𝑞(𝑞 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎))))) = ((Poly1‘(𝑛 Mat 𝑟)) Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟))))))
38 oveq12 6558 . . . . . . . . 9 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑛 Mat 𝑟) = (𝑁 Mat 𝑅))
3938fveq2d 6107 . . . . . . . 8 ((𝑛 = 𝑁𝑟 = 𝑅) → (Poly1‘(𝑛 Mat 𝑟)) = (Poly1‘(𝑁 Mat 𝑅)))
40 pm2mpval.q . . . . . . . . 9 𝑄 = (Poly1𝐴)
41 pm2mpval.a . . . . . . . . . 10 𝐴 = (𝑁 Mat 𝑅)
4241fveq2i 6106 . . . . . . . . 9 (Poly1𝐴) = (Poly1‘(𝑁 Mat 𝑅))
4340, 42eqtri 2632 . . . . . . . 8 𝑄 = (Poly1‘(𝑁 Mat 𝑅))
4439, 43syl6eqr 2662 . . . . . . 7 ((𝑛 = 𝑁𝑟 = 𝑅) → (Poly1‘(𝑛 Mat 𝑟)) = 𝑄)
4539fveq2d 6107 . . . . . . . . . 10 ((𝑛 = 𝑁𝑟 = 𝑅) → ( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟))) = ( ·𝑠 ‘(Poly1‘(𝑁 Mat 𝑅))))
46 pm2mpval.m . . . . . . . . . . 11 = ( ·𝑠𝑄)
4743fveq2i 6106 . . . . . . . . . . 11 ( ·𝑠𝑄) = ( ·𝑠 ‘(Poly1‘(𝑁 Mat 𝑅)))
4846, 47eqtri 2632 . . . . . . . . . 10 = ( ·𝑠 ‘(Poly1‘(𝑁 Mat 𝑅)))
4945, 48syl6eqr 2662 . . . . . . . . 9 ((𝑛 = 𝑁𝑟 = 𝑅) → ( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟))) = )
50 eqidd 2611 . . . . . . . . 9 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑚 decompPMat 𝑘) = (𝑚 decompPMat 𝑘))
5139fveq2d 6107 . . . . . . . . . . . 12 ((𝑛 = 𝑁𝑟 = 𝑅) → (mulGrp‘(Poly1‘(𝑛 Mat 𝑟))) = (mulGrp‘(Poly1‘(𝑁 Mat 𝑅))))
5251fveq2d 6107 . . . . . . . . . . 11 ((𝑛 = 𝑁𝑟 = 𝑅) → (.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟)))) = (.g‘(mulGrp‘(Poly1‘(𝑁 Mat 𝑅)))))
53 pm2mpval.e . . . . . . . . . . . 12 = (.g‘(mulGrp‘𝑄))
5443fveq2i 6106 . . . . . . . . . . . . 13 (mulGrp‘𝑄) = (mulGrp‘(Poly1‘(𝑁 Mat 𝑅)))
5554fveq2i 6106 . . . . . . . . . . . 12 (.g‘(mulGrp‘𝑄)) = (.g‘(mulGrp‘(Poly1‘(𝑁 Mat 𝑅))))
5653, 55eqtri 2632 . . . . . . . . . . 11 = (.g‘(mulGrp‘(Poly1‘(𝑁 Mat 𝑅))))
5752, 56syl6eqr 2662 . . . . . . . . . 10 ((𝑛 = 𝑁𝑟 = 𝑅) → (.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟)))) = )
58 eqidd 2611 . . . . . . . . . 10 ((𝑛 = 𝑁𝑟 = 𝑅) → 𝑘 = 𝑘)
5938fveq2d 6107 . . . . . . . . . . 11 ((𝑛 = 𝑁𝑟 = 𝑅) → (var1‘(𝑛 Mat 𝑟)) = (var1‘(𝑁 Mat 𝑅)))
60 pm2mpval.x . . . . . . . . . . . 12 𝑋 = (var1𝐴)
6141fveq2i 6106 . . . . . . . . . . . 12 (var1𝐴) = (var1‘(𝑁 Mat 𝑅))
6260, 61eqtri 2632 . . . . . . . . . . 11 𝑋 = (var1‘(𝑁 Mat 𝑅))
6359, 62syl6eqr 2662 . . . . . . . . . 10 ((𝑛 = 𝑁𝑟 = 𝑅) → (var1‘(𝑛 Mat 𝑟)) = 𝑋)
6457, 58, 63oveq123d 6570 . . . . . . . . 9 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟))) = (𝑘 𝑋))
6549, 50, 64oveq123d 6570 . . . . . . . 8 ((𝑛 = 𝑁𝑟 = 𝑅) → ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟)))) = ((𝑚 decompPMat 𝑘) (𝑘 𝑋)))
6665mpteq2dv 4673 . . . . . . 7 ((𝑛 = 𝑁𝑟 = 𝑅) → (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟))))) = (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋))))
6744, 66oveq12d 6567 . . . . . 6 ((𝑛 = 𝑁𝑟 = 𝑅) → ((Poly1‘(𝑛 Mat 𝑟)) Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟)))))) = (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋)))))
6867adantl 481 . . . . 5 (((𝑁 ∈ Fin ∧ 𝑅𝑉) ∧ (𝑛 = 𝑁𝑟 = 𝑅)) → ((Poly1‘(𝑛 Mat 𝑟)) Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠 ‘(Poly1‘(𝑛 Mat 𝑟)))(𝑘(.g‘(mulGrp‘(Poly1‘(𝑛 Mat 𝑟))))(var1‘(𝑛 Mat 𝑟)))))) = (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋)))))
6937, 68syl5eq 2656 . . . 4 (((𝑁 ∈ Fin ∧ 𝑅𝑉) ∧ (𝑛 = 𝑁𝑟 = 𝑅)) → (𝑛 Mat 𝑟) / 𝑎(Poly1𝑎) / 𝑞(𝑞 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎))))) = (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋)))))
7017, 69mpteq12dv 4663 . . 3 (((𝑁 ∈ Fin ∧ 𝑅𝑉) ∧ (𝑛 = 𝑁𝑟 = 𝑅)) → (𝑚 ∈ (Base‘(𝑛 Mat (Poly1𝑟))) ↦ (𝑛 Mat 𝑟) / 𝑎(Poly1𝑎) / 𝑞(𝑞 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘)( ·𝑠𝑞)(𝑘(.g‘(mulGrp‘𝑞))(var1𝑎)))))) = (𝑚𝐵 ↦ (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋))))))
71 simpl 472 . . 3 ((𝑁 ∈ Fin ∧ 𝑅𝑉) → 𝑁 ∈ Fin)
72 elex 3185 . . . 4 (𝑅𝑉𝑅 ∈ V)
7372adantl 481 . . 3 ((𝑁 ∈ Fin ∧ 𝑅𝑉) → 𝑅 ∈ V)
74 fvex 6113 . . . . . 6 (Base‘𝐶) ∈ V
759, 74eqeltri 2684 . . . . 5 𝐵 ∈ V
7675mptex 6390 . . . 4 (𝑚𝐵 ↦ (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋))))) ∈ V
7776a1i 11 . . 3 ((𝑁 ∈ Fin ∧ 𝑅𝑉) → (𝑚𝐵 ↦ (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋))))) ∈ V)
783, 70, 71, 73, 77ovmpt2d 6686 . 2 ((𝑁 ∈ Fin ∧ 𝑅𝑉) → (𝑁 pMatToMatPoly 𝑅) = (𝑚𝐵 ↦ (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋))))))
791, 78syl5eq 2656 1 ((𝑁 ∈ Fin ∧ 𝑅𝑉) → 𝑇 = (𝑚𝐵 ↦ (𝑄 Σg (𝑘 ∈ ℕ0 ↦ ((𝑚 decompPMat 𝑘) (𝑘 𝑋))))))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  Vcvv 3173  ⦋csb 3499   ↦ cmpt 4643  ‘cfv 5804  (class class class)co 6549   ↦ cmpt2 6551  Fincfn 7841  ℕ0cn0 11169  Basecbs 15695   ·𝑠 cvsca 15772   Σg cgsu 15924  .gcmg 17363  mulGrpcmgp 18312  var1cv1 19367  Poly1cpl1 19368   Mat cmat 20032   decompPMat cdecpmat 20386   pMatToMatPoly cpm2mp 20416 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pr 4833 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-pm2mp 20417 This theorem is referenced by:  pm2mpfval  20420  pm2mpf  20422
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