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Theorem mplasclco 33815
Description: Case where composing an algebra scalar lifting functions with a scalar leads to a scalar. This is useful when working with selectVars. (Contributed by Thierry Arnoux, 4-May-2026.)
Hypotheses
Ref Expression
mplasclco.s 𝑆 = (Base‘𝑅)
mplasclco.o 𝑂 = (𝐽 mPoly 𝑅)
mplasclco.p 𝑃 = (𝐼 mPoly 𝑅)
mplasclco.q 𝑄 = (𝐼 mPoly 𝑂)
mplasclco.a 𝐴 = (algSc‘𝑂)
mplasclco.b 𝐵 = (algSc‘𝑃)
mplasclco.c 𝐶 = (algSc‘𝑄)
mplasclco.d 𝐷 = { ∈ (ℕ0m 𝐼) ∣ ( “ ℕ) ∈ Fin}
mplasclco.e 𝐸 = {𝑗 ∈ (ℕ0m 𝐽) ∣ (𝑗 “ ℕ) ∈ Fin}
mplasclco.i (𝜑𝐼𝑉)
mplasclco.j (𝜑𝐽𝐼)
mplasclco.r (𝜑𝑅 ∈ CRing)
mplasclco.x (𝜑𝑋𝑆)
Assertion
Ref Expression
mplasclco (𝜑 → (𝐴 ∘ (𝐵𝑋)) = (𝐶‘(𝐴𝑋)))
Distinct variable groups:   ,𝐼   𝑗,𝐽   ,𝑂   𝑅,   𝑅,𝑗
Allowed substitution hints:   𝜑(,𝑗)   𝐴(,𝑗)   𝐵(,𝑗)   𝐶(,𝑗)   𝐷(,𝑗)   𝑃(,𝑗)   𝑄(,𝑗)   𝑆(,𝑗)   𝐸(,𝑗)   𝐼(𝑗)   𝐽()   𝑂(𝑗)   𝑉(,𝑗)   𝑋(,𝑗)

Proof of Theorem mplasclco
Dummy variables 𝑛 𝑚 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 mplasclco.o . . . . 5 𝑂 = (𝐽 mPoly 𝑅)
2 eqid 2763 . . . . 5 (Base‘𝑂) = (Base‘𝑂)
3 mplasclco.s . . . . 5 𝑆 = (Base‘𝑅)
4 mplasclco.a . . . . 5 𝐴 = (algSc‘𝑂)
5 mplasclco.i . . . . . 6 (𝜑𝐼𝑉)
6 mplasclco.j . . . . . 6 (𝜑𝐽𝐼)
75, 6ssexd 5281 . . . . 5 (𝜑𝐽 ∈ V)
8 mplasclco.r . . . . . 6 (𝜑𝑅 ∈ CRing)
98crngringd 20306 . . . . 5 (𝜑𝑅 ∈ Ring)
101, 2, 3, 4, 7, 9mplasclf 22125 . . . 4 (𝜑𝐴:𝑆⟶(Base‘𝑂))
11 mplasclco.p . . . . . 6 𝑃 = (𝐼 mPoly 𝑅)
12 mplasclco.d . . . . . 6 𝐷 = { ∈ (ℕ0m 𝐼) ∣ ( “ ℕ) ∈ Fin}
13 eqid 2763 . . . . . 6 (0g𝑅) = (0g𝑅)
14 mplasclco.b . . . . . 6 𝐵 = (algSc‘𝑃)
15 mplasclco.x . . . . . 6 (𝜑𝑋𝑆)
1611, 12, 13, 3, 14, 5, 9, 15mplascl 22124 . . . . 5 (𝜑 → (𝐵𝑋) = (𝑛𝐷 ↦ if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅))))
178crnggrpd 20307 . . . . . . . 8 (𝜑𝑅 ∈ Grp)
183, 13, 17grpidcld 33224 . . . . . . 7 (𝜑 → (0g𝑅) ∈ 𝑆)
1915, 18ifcld 4528 . . . . . 6 (𝜑 → if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)) ∈ 𝑆)
2019adantr 484 . . . . 5 ((𝜑𝑛𝐷) → if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)) ∈ 𝑆)
2116, 20fmpt3d 7097 . . . 4 (𝜑 → (𝐵𝑋):𝐷𝑆)
2210, 21fcod 6717 . . 3 (𝜑 → (𝐴 ∘ (𝐵𝑋)):𝐷⟶(Base‘𝑂))
2322ffnd 6692 . 2 (𝜑 → (𝐴 ∘ (𝐵𝑋)) Fn 𝐷)
24 mplasclco.q . . . . 5 𝑄 = (𝐼 mPoly 𝑂)
25 eqid 2763 . . . . 5 (0g𝑂) = (0g𝑂)
26 mplasclco.c . . . . 5 𝐶 = (algSc‘𝑄)
271, 7, 9mplringd 22081 . . . . 5 (𝜑𝑂 ∈ Ring)
28 eqid 2763 . . . . . 6 (Scalar‘𝑂) = (Scalar‘𝑂)
29 eqid 2763 . . . . . 6 (Base‘(Scalar‘𝑂)) = (Base‘(Scalar‘𝑂))
301mplassa 22080 . . . . . . 7 ((𝐽 ∈ V ∧ 𝑅 ∈ CRing) → 𝑂 ∈ AssAlg)
317, 8, 30syl2anc 593 . . . . . 6 (𝜑𝑂 ∈ AssAlg)
321, 7, 8mplsca 22071 . . . . . . . . 9 (𝜑𝑅 = (Scalar‘𝑂))
3332fveq2d 6871 . . . . . . . 8 (𝜑 → (Base‘𝑅) = (Base‘(Scalar‘𝑂)))
343, 33eqtrid 2810 . . . . . . 7 (𝜑𝑆 = (Base‘(Scalar‘𝑂)))
3515, 34eleqtrd 2865 . . . . . 6 (𝜑𝑋 ∈ (Base‘(Scalar‘𝑂)))
364, 28, 29, 31, 35asclelbas 21942 . . . . 5 (𝜑 → (𝐴𝑋) ∈ (Base‘𝑂))
3724, 12, 25, 2, 26, 5, 27, 36mplascl 22124 . . . 4 (𝜑 → (𝐶‘(𝐴𝑋)) = (𝑛𝐷 ↦ if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂))))
3827ringgrpd 20302 . . . . . . 7 (𝜑𝑂 ∈ Grp)
392, 25, 38grpidcld 33224 . . . . . 6 (𝜑 → (0g𝑂) ∈ (Base‘𝑂))
4036, 39ifcld 4528 . . . . 5 (𝜑 → if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)) ∈ (Base‘𝑂))
4140adantr 484 . . . 4 ((𝜑𝑛𝐷) → if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)) ∈ (Base‘𝑂))
4237, 41fmpt3d 7097 . . 3 (𝜑 → (𝐶‘(𝐴𝑋)):𝐷⟶(Base‘𝑂))
4342ffnd 6692 . 2 (𝜑 → (𝐶‘(𝐴𝑋)) Fn 𝐷)
44 eqeq2 2775 . . . . 5 ((𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)})) → ((𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))) ↔ (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)}))))
45 eqeq2 2775 . . . . 5 ((𝐸 × {(0g𝑅)}) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)})) → ((𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = (𝐸 × {(0g𝑅)}) ↔ (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)}))))
46 simpr 488 . . . . . . 7 (((𝜑𝑛𝐷) ∧ 𝑛 = (𝐼 × {0})) → 𝑛 = (𝐼 × {0}))
4746iftrued 4489 . . . . . 6 (((𝜑𝑛𝐷) ∧ 𝑛 = (𝐼 × {0})) → if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅)) = if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)))
4847mpteq2dv 5195 . . . . 5 (((𝜑𝑛𝐷) ∧ 𝑛 = (𝐼 × {0})) → (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))))
49 simpr 488 . . . . . . . 8 (((𝜑𝑛𝐷) ∧ ¬ 𝑛 = (𝐼 × {0})) → ¬ 𝑛 = (𝐼 × {0}))
5049iffalsed 4492 . . . . . . 7 (((𝜑𝑛𝐷) ∧ ¬ 𝑛 = (𝐼 × {0})) → if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅)) = (0g𝑅))
5150mpteq2dv 5195 . . . . . 6 (((𝜑𝑛𝐷) ∧ ¬ 𝑛 = (𝐼 × {0})) → (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = (𝑚𝐸 ↦ (0g𝑅)))
52 fconstmpt 5710 . . . . . 6 (𝐸 × {(0g𝑅)}) = (𝑚𝐸 ↦ (0g𝑅))
5351, 52eqtr4di 2816 . . . . 5 (((𝜑𝑛𝐷) ∧ ¬ 𝑛 = (𝐼 × {0})) → (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = (𝐸 × {(0g𝑅)}))
5444, 45, 48, 53ifbothda 4520 . . . 4 ((𝜑𝑛𝐷) → (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)})))
55 mplasclco.e . . . . . 6 𝐸 = {𝑗 ∈ (ℕ0m 𝐽) ∣ (𝑗 “ ℕ) ∈ Fin}
567adantr 484 . . . . . 6 ((𝜑𝑛𝐷) → 𝐽 ∈ V)
579adantr 484 . . . . . 6 ((𝜑𝑛𝐷) → 𝑅 ∈ Ring)
5821ffvelcdmda 7065 . . . . . 6 ((𝜑𝑛𝐷) → ((𝐵𝑋)‘𝑛) ∈ 𝑆)
591, 55, 13, 3, 4, 56, 57, 58mplascl 22124 . . . . 5 ((𝜑𝑛𝐷) → (𝐴‘((𝐵𝑋)‘𝑛)) = (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), ((𝐵𝑋)‘𝑛), (0g𝑅))))
6016, 20fvmpt2d 6989 . . . . . . . . 9 ((𝜑𝑛𝐷) → ((𝐵𝑋)‘𝑛) = if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)))
6160adantr 484 . . . . . . . 8 (((𝜑𝑛𝐷) ∧ 𝑚𝐸) → ((𝐵𝑋)‘𝑛) = if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)))
6261ifeq1d 4501 . . . . . . 7 (((𝜑𝑛𝐷) ∧ 𝑚𝐸) → if(𝑚 = (𝐽 × {0}), ((𝐵𝑋)‘𝑛), (0g𝑅)) = if(𝑚 = (𝐽 × {0}), if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)), (0g𝑅)))
63 ififcom 32755 . . . . . . 7 if(𝑚 = (𝐽 × {0}), if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)), (0g𝑅)) = if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))
6462, 63eqtrdi 2814 . . . . . 6 (((𝜑𝑛𝐷) ∧ 𝑚𝐸) → if(𝑚 = (𝐽 × {0}), ((𝐵𝑋)‘𝑛), (0g𝑅)) = if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅)))
6564mpteq2dva 5194 . . . . 5 ((𝜑𝑛𝐷) → (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), ((𝐵𝑋)‘𝑛), (0g𝑅))) = (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))))
6659, 65eqtrd 2798 . . . 4 ((𝜑𝑛𝐷) → (𝐴‘((𝐵𝑋)‘𝑛)) = (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))))
671, 55, 13, 3, 4, 7, 9, 15mplascl 22124 . . . . . 6 (𝜑 → (𝐴𝑋) = (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))))
681, 55, 13, 25, 7, 17mpl0 22064 . . . . . 6 (𝜑 → (0g𝑂) = (𝐸 × {(0g𝑅)}))
6967, 68ifeq12d 4503 . . . . 5 (𝜑 → if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)})))
7069adantr 484 . . . 4 ((𝜑𝑛𝐷) → if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)})))
7154, 66, 703eqtr4d 2808 . . 3 ((𝜑𝑛𝐷) → (𝐴‘((𝐵𝑋)‘𝑛)) = if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)))
7221adantr 484 . . . 4 ((𝜑𝑛𝐷) → (𝐵𝑋):𝐷𝑆)
73 simpr 488 . . . 4 ((𝜑𝑛𝐷) → 𝑛𝐷)
7472, 73fvco3d 6968 . . 3 ((𝜑𝑛𝐷) → ((𝐴 ∘ (𝐵𝑋))‘𝑛) = (𝐴‘((𝐵𝑋)‘𝑛)))
7537, 41fvmpt2d 6989 . . 3 ((𝜑𝑛𝐷) → ((𝐶‘(𝐴𝑋))‘𝑛) = if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)))
7671, 74, 753eqtr4d 2808 . 2 ((𝜑𝑛𝐷) → ((𝐴 ∘ (𝐵𝑋))‘𝑛) = ((𝐶‘(𝐴𝑋))‘𝑛))
7723, 43, 76eqfnfvd 7014 1 (𝜑 → (𝐴 ∘ (𝐵𝑋)) = (𝐶‘(𝐴𝑋)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 399   = wceq 1561  wcel 2143  {crab 3415  Vcvv 3455  wss 3905  ifcif 4481  {csn 4583  cmpt 5182   × cxp 5646  ccnv 5647  cima 5651  ccom 5652  wf 6517  cfv 6521  (class class class)co 7396  m cmap 8808  Fincfn 8927  0cc0 11084  cn 12220  0cn0 12491  Basecbs 17255  Scalarcsca 17299  0gc0g 17478  Ringcrg 20293  CRingccrg 20294  AssAlgcasa 21909  algSccascl 21911   mPoly cmpl 21965
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1816  ax-4 1830  ax-5 1931  ax-6 1988  ax-7 2029  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-rep 5228  ax-sep 5247  ax-nul 5257  ax-pow 5323  ax-pr 5391  ax-un 7718  ax-cnex 11140  ax-resscn 11141  ax-1cn 11142  ax-icn 11143  ax-addcl 11144  ax-addrcl 11145  ax-mulcl 11146  ax-mulrcl 11147  ax-mulcom 11148  ax-addass 11149  ax-mulass 11150  ax-distr 11151  ax-i2m1 11152  ax-1ne0 11153  ax-1rid 11154  ax-rnegex 11155  ax-rrecex 11156  ax-cnre 11157  ax-pre-lttri 11158  ax-pre-lttrn 11159  ax-pre-ltadd 11160  ax-pre-mulgt0 11161
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3or 1100  df-3an 1101  df-tru 1564  df-fal 1574  df-ex 1801  df-nf 1805  df-sb 2092  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-nel 3063  df-ral 3078  df-rex 3088  df-rmo 3368  df-reu 3369  df-rab 3416  df-v 3457  df-sbc 3746  df-csb 3854  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-pss 3925  df-nul 4287  df-if 4482  df-pw 4558  df-sn 4584  df-pr 4586  df-tp 4588  df-op 4590  df-uni 4867  df-int 4907  df-iun 4952  df-iin 4953  df-br 5102  df-opab 5164  df-mpt 5183  df-tr 5209  df-id 5543  df-eprel 5548  df-po 5556  df-so 5557  df-fr 5601  df-se 5602  df-we 5603  df-xp 5654  df-rel 5655  df-cnv 5656  df-co 5657  df-dm 5658  df-rn 5659  df-res 5660  df-ima 5661  df-pred 6288  df-ord 6349  df-on 6350  df-lim 6351  df-suc 6352  df-iota 6477  df-fun 6523  df-fn 6524  df-f 6525  df-f1 6526  df-fo 6527  df-f1o 6528  df-fv 6529  df-isom 6530  df-riota 7353  df-ov 7399  df-oprab 7400  df-mpo 7401  df-of 7660  df-ofr 7661  df-om 7847  df-1st 7970  df-2nd 7971  df-supp 8141  df-frecs 8262  df-wrecs 8293  df-recs 8342  df-rdg 8381  df-1o 8437  df-2o 8438  df-er 8678  df-map 8810  df-pm 8811  df-ixp 8880  df-en 8928  df-dom 8929  df-sdom 8930  df-fin 8931  df-fsupp 9306  df-sup 9386  df-oi 9456  df-card 9909  df-pnf 11229  df-mnf 11230  df-xr 11231  df-ltxr 11232  df-le 11233  df-sub 11427  df-neg 11428  df-nn 12221  df-2 12290  df-3 12291  df-4 12292  df-5 12293  df-6 12294  df-7 12295  df-8 12296  df-9 12297  df-n0 12492  df-z 12579  df-dec 12699  df-uz 12850  df-fz 13523  df-fzo 13670  df-seq 14025  df-hash 14354  df-struct 17193  df-sets 17210  df-slot 17228  df-ndx 17240  df-base 17256  df-ress 17277  df-plusg 17309  df-mulr 17310  df-sca 17312  df-vsca 17313  df-ip 17314  df-tset 17315  df-ple 17316  df-ds 17318  df-hom 17320  df-cco 17321  df-0g 17480  df-gsum 17481  df-prds 17486  df-pws 17488  df-mre 17624  df-mrc 17625  df-acs 17627  df-mgm 18684  df-sgrp 18763  df-mnd 18779  df-mhm 18827  df-submnd 18828  df-grp 18988  df-minusg 18989  df-sbg 18990  df-mulg 19120  df-subg 19175  df-ghm 19264  df-cntz 19367  df-cmn 19832  df-abl 19833  df-mgp 20197  df-rng 20209  df-ur 20242  df-ring 20295  df-cring 20296  df-subrng 20606  df-subrg 20630  df-lmod 20936  df-lss 21006  df-assa 21912  df-ascl 21914  df-psr 21968  df-mpl 21970
This theorem is referenced by:  selvascl  33816
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