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Theorem mplasclco 33757
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 2752 . . . . 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 5270 . . . . 5 (𝜑𝐽 ∈ V)
8 mplasclco.r . . . . . 6 (𝜑𝑅 ∈ CRing)
98crngringd 20264 . . . . 5 (𝜑𝑅 ∈ Ring)
101, 2, 3, 4, 7, 9mplasclf 22087 . . . 4 (𝜑𝐴:𝑆⟶(Base‘𝑂))
11 mplasclco.p . . . . . 6 𝑃 = (𝐼 mPoly 𝑅)
12 mplasclco.d . . . . . 6 𝐷 = { ∈ (ℕ0m 𝐼) ∣ ( “ ℕ) ∈ Fin}
13 eqid 2752 . . . . . 6 (0g𝑅) = (0g𝑅)
14 mplasclco.b . . . . . 6 𝐵 = (algSc‘𝑃)
15 mplasclco.x . . . . . 6 (𝜑𝑋𝑆)
1611, 12, 13, 3, 14, 5, 9, 15mplascl 22086 . . . . 5 (𝜑 → (𝐵𝑋) = (𝑛𝐷 ↦ if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅))))
178crnggrpd 20265 . . . . . . . 8 (𝜑𝑅 ∈ Grp)
183, 13, 17grpidcld 33168 . . . . . . 7 (𝜑 → (0g𝑅) ∈ 𝑆)
1915, 18ifcld 4517 . . . . . 6 (𝜑 → if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)) ∈ 𝑆)
2019adantr 483 . . . . 5 ((𝜑𝑛𝐷) → if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)) ∈ 𝑆)
2116, 20fmpt3d 7082 . . . 4 (𝜑 → (𝐵𝑋):𝐷𝑆)
2210, 21fcod 6702 . . 3 (𝜑 → (𝐴 ∘ (𝐵𝑋)):𝐷⟶(Base‘𝑂))
2322ffnd 6677 . 2 (𝜑 → (𝐴 ∘ (𝐵𝑋)) Fn 𝐷)
24 mplasclco.q . . . . 5 𝑄 = (𝐼 mPoly 𝑂)
25 eqid 2752 . . . . 5 (0g𝑂) = (0g𝑂)
26 mplasclco.c . . . . 5 𝐶 = (algSc‘𝑄)
271, 7, 9mplringd 22043 . . . . 5 (𝜑𝑂 ∈ Ring)
28 eqid 2752 . . . . . 6 (Scalar‘𝑂) = (Scalar‘𝑂)
29 eqid 2752 . . . . . 6 (Base‘(Scalar‘𝑂)) = (Base‘(Scalar‘𝑂))
301mplassa 22042 . . . . . . 7 ((𝐽 ∈ V ∧ 𝑅 ∈ CRing) → 𝑂 ∈ AssAlg)
317, 8, 30syl2anc 592 . . . . . 6 (𝜑𝑂 ∈ AssAlg)
321, 7, 8mplsca 22033 . . . . . . . . 9 (𝜑𝑅 = (Scalar‘𝑂))
3332fveq2d 6856 . . . . . . . 8 (𝜑 → (Base‘𝑅) = (Base‘(Scalar‘𝑂)))
343, 33eqtrid 2799 . . . . . . 7 (𝜑𝑆 = (Base‘(Scalar‘𝑂)))
3515, 34eleqtrd 2854 . . . . . 6 (𝜑𝑋 ∈ (Base‘(Scalar‘𝑂)))
364, 28, 29, 31, 35asclelbas 21904 . . . . 5 (𝜑 → (𝐴𝑋) ∈ (Base‘𝑂))
3724, 12, 25, 2, 26, 5, 27, 36mplascl 22086 . . . 4 (𝜑 → (𝐶‘(𝐴𝑋)) = (𝑛𝐷 ↦ if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂))))
3827ringgrpd 20260 . . . . . . 7 (𝜑𝑂 ∈ Grp)
392, 25, 38grpidcld 33168 . . . . . 6 (𝜑 → (0g𝑂) ∈ (Base‘𝑂))
4036, 39ifcld 4517 . . . . 5 (𝜑 → if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)) ∈ (Base‘𝑂))
4140adantr 483 . . . 4 ((𝜑𝑛𝐷) → if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)) ∈ (Base‘𝑂))
4237, 41fmpt3d 7082 . . 3 (𝜑 → (𝐶‘(𝐴𝑋)):𝐷⟶(Base‘𝑂))
4342ffnd 6677 . 2 (𝜑 → (𝐶‘(𝐴𝑋)) Fn 𝐷)
44 eqeq2 2764 . . . . 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 2764 . . . . 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 487 . . . . . . 7 (((𝜑𝑛𝐷) ∧ 𝑛 = (𝐼 × {0})) → 𝑛 = (𝐼 × {0}))
4746iftrued 4478 . . . . . 6 (((𝜑𝑛𝐷) ∧ 𝑛 = (𝐼 × {0})) → if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅)) = if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)))
4847mpteq2dv 5184 . . . . 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 487 . . . . . . . 8 (((𝜑𝑛𝐷) ∧ ¬ 𝑛 = (𝐼 × {0})) → ¬ 𝑛 = (𝐼 × {0}))
5049iffalsed 4481 . . . . . . 7 (((𝜑𝑛𝐷) ∧ ¬ 𝑛 = (𝐼 × {0})) → if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅)) = (0g𝑅))
5150mpteq2dv 5184 . . . . . 6 (((𝜑𝑛𝐷) ∧ ¬ 𝑛 = (𝐼 × {0})) → (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = (𝑚𝐸 ↦ (0g𝑅)))
52 fconstmpt 5698 . . . . . 6 (𝐸 × {(0g𝑅)}) = (𝑚𝐸 ↦ (0g𝑅))
5351, 52eqtr4di 2805 . . . . 5 (((𝜑𝑛𝐷) ∧ ¬ 𝑛 = (𝐼 × {0})) → (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))) = (𝐸 × {(0g𝑅)}))
5444, 45, 48, 53ifbothda 4509 . . . 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 483 . . . . . 6 ((𝜑𝑛𝐷) → 𝐽 ∈ V)
579adantr 483 . . . . . 6 ((𝜑𝑛𝐷) → 𝑅 ∈ Ring)
5821ffvelcdmda 7050 . . . . . 6 ((𝜑𝑛𝐷) → ((𝐵𝑋)‘𝑛) ∈ 𝑆)
591, 55, 13, 3, 4, 56, 57, 58mplascl 22086 . . . . 5 ((𝜑𝑛𝐷) → (𝐴‘((𝐵𝑋)‘𝑛)) = (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), ((𝐵𝑋)‘𝑛), (0g𝑅))))
6016, 20fvmpt2d 6974 . . . . . . . . 9 ((𝜑𝑛𝐷) → ((𝐵𝑋)‘𝑛) = if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)))
6160adantr 483 . . . . . . . 8 (((𝜑𝑛𝐷) ∧ 𝑚𝐸) → ((𝐵𝑋)‘𝑛) = if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)))
6261ifeq1d 4490 . . . . . . 7 (((𝜑𝑛𝐷) ∧ 𝑚𝐸) → if(𝑚 = (𝐽 × {0}), ((𝐵𝑋)‘𝑛), (0g𝑅)) = if(𝑚 = (𝐽 × {0}), if(𝑛 = (𝐼 × {0}), 𝑋, (0g𝑅)), (0g𝑅)))
63 ififcom 32687 . . . . . . 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 2803 . . . . . 6 (((𝜑𝑛𝐷) ∧ 𝑚𝐸) → if(𝑚 = (𝐽 × {0}), ((𝐵𝑋)‘𝑛), (0g𝑅)) = if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅)))
6564mpteq2dva 5183 . . . . 5 ((𝜑𝑛𝐷) → (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), ((𝐵𝑋)‘𝑛), (0g𝑅))) = (𝑚𝐸 ↦ if(𝑛 = (𝐼 × {0}), if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅)), (0g𝑅))))
6659, 65eqtrd 2787 . . . 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 22086 . . . . . 6 (𝜑 → (𝐴𝑋) = (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))))
681, 55, 13, 25, 7, 17mpl0 22026 . . . . . 6 (𝜑 → (0g𝑂) = (𝐸 × {(0g𝑅)}))
6967, 68ifeq12d 4492 . . . . 5 (𝜑 → if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)})))
7069adantr 483 . . . 4 ((𝜑𝑛𝐷) → if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)) = if(𝑛 = (𝐼 × {0}), (𝑚𝐸 ↦ if(𝑚 = (𝐽 × {0}), 𝑋, (0g𝑅))), (𝐸 × {(0g𝑅)})))
7154, 66, 703eqtr4d 2797 . . 3 ((𝜑𝑛𝐷) → (𝐴‘((𝐵𝑋)‘𝑛)) = if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)))
7221adantr 483 . . . 4 ((𝜑𝑛𝐷) → (𝐵𝑋):𝐷𝑆)
73 simpr 487 . . . 4 ((𝜑𝑛𝐷) → 𝑛𝐷)
7472, 73fvco3d 6953 . . 3 ((𝜑𝑛𝐷) → ((𝐴 ∘ (𝐵𝑋))‘𝑛) = (𝐴‘((𝐵𝑋)‘𝑛)))
7537, 41fvmpt2d 6974 . . 3 ((𝜑𝑛𝐷) → ((𝐶‘(𝐴𝑋))‘𝑛) = if(𝑛 = (𝐼 × {0}), (𝐴𝑋), (0g𝑂)))
7671, 74, 753eqtr4d 2797 . 2 ((𝜑𝑛𝐷) → ((𝐴 ∘ (𝐵𝑋))‘𝑛) = ((𝐶‘(𝐴𝑋))‘𝑛))
7723, 43, 76eqfnfvd 6999 1 (𝜑 → (𝐴 ∘ (𝐵𝑋)) = (𝐶‘(𝐴𝑋)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 398   = wceq 1550  wcel 2132  {crab 3404  Vcvv 3444  wss 3895  ifcif 4470  {csn 4572  cmpt 5171   × cxp 5634  ccnv 5635  cima 5639  ccom 5640  wf 6502  cfv 6506  (class class class)co 7381  m cmap 8792  Fincfn 8912  0cc0 11059  cn 12196  0cn0 12467  Basecbs 17217  Scalarcsca 17261  0gc0g 17440  Ringcrg 20251  CRingccrg 20252  AssAlgcasa 21871  algSccascl 21873   mPoly cmpl 21927
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1805  ax-4 1819  ax-5 1920  ax-6 1977  ax-7 2018  ax-8 2134  ax-9 2142  ax-10 2165  ax-11 2181  ax-12 2202  ax-ext 2724  ax-rep 5217  ax-sep 5236  ax-nul 5246  ax-pow 5312  ax-pr 5380  ax-un 7703  ax-cnex 11115  ax-resscn 11116  ax-1cn 11117  ax-icn 11118  ax-addcl 11119  ax-addrcl 11120  ax-mulcl 11121  ax-mulrcl 11122  ax-mulcom 11123  ax-addass 11124  ax-mulass 11125  ax-distr 11126  ax-i2m1 11127  ax-1ne0 11128  ax-1rid 11129  ax-rnegex 11130  ax-rrecex 11131  ax-cnre 11132  ax-pre-lttri 11133  ax-pre-lttrn 11134  ax-pre-ltadd 11135  ax-pre-mulgt0 11136
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 857  df-3or 1096  df-3an 1097  df-tru 1553  df-fal 1563  df-ex 1790  df-nf 1794  df-sb 2081  df-mo 2556  df-eu 2586  df-clab 2731  df-cleq 2744  df-clel 2827  df-nfc 2901  df-ne 2948  df-nel 3052  df-ral 3067  df-rex 3077  df-rmo 3357  df-reu 3358  df-rab 3405  df-v 3446  df-sbc 3736  df-csb 3844  df-dif 3898  df-un 3900  df-in 3902  df-ss 3912  df-pss 3915  df-nul 4277  df-if 4471  df-pw 4547  df-sn 4573  df-pr 4575  df-tp 4577  df-op 4579  df-uni 4856  df-int 4896  df-iun 4941  df-iin 4942  df-br 5091  df-opab 5153  df-mpt 5172  df-tr 5198  df-id 5531  df-eprel 5536  df-po 5544  df-so 5545  df-fr 5589  df-se 5590  df-we 5591  df-xp 5642  df-rel 5643  df-cnv 5644  df-co 5645  df-dm 5646  df-rn 5647  df-res 5648  df-ima 5649  df-pred 6273  df-ord 6334  df-on 6335  df-lim 6336  df-suc 6337  df-iota 6462  df-fun 6508  df-fn 6509  df-f 6510  df-f1 6511  df-fo 6512  df-f1o 6513  df-fv 6514  df-isom 6515  df-riota 7338  df-ov 7384  df-oprab 7385  df-mpo 7386  df-of 7645  df-ofr 7646  df-om 7832  df-1st 7955  df-2nd 7956  df-supp 8125  df-frecs 8246  df-wrecs 8277  df-recs 8326  df-rdg 8365  df-1o 8421  df-2o 8422  df-er 8662  df-map 8794  df-pm 8795  df-ixp 8865  df-en 8913  df-dom 8914  df-sdom 8915  df-fin 8916  df-fsupp 9294  df-sup 9374  df-oi 9444  df-card 9883  df-pnf 11204  df-mnf 11205  df-xr 11206  df-ltxr 11207  df-le 11208  df-sub 11402  df-neg 11403  df-nn 12197  df-2 12266  df-3 12267  df-4 12268  df-5 12269  df-6 12270  df-7 12271  df-8 12272  df-9 12273  df-n0 12468  df-z 12555  df-dec 12675  df-uz 12826  df-fz 13499  df-fzo 13646  df-seq 14001  df-hash 14330  df-struct 17155  df-sets 17172  df-slot 17190  df-ndx 17202  df-base 17218  df-ress 17239  df-plusg 17271  df-mulr 17272  df-sca 17274  df-vsca 17275  df-ip 17276  df-tset 17277  df-ple 17278  df-ds 17280  df-hom 17282  df-cco 17283  df-0g 17442  df-gsum 17443  df-prds 17448  df-pws 17450  df-mre 17586  df-mrc 17587  df-acs 17589  df-mgm 18646  df-sgrp 18725  df-mnd 18741  df-mhm 18789  df-submnd 18790  df-grp 18950  df-minusg 18951  df-sbg 18952  df-mulg 19082  df-subg 19137  df-ghm 19226  df-cntz 19329  df-cmn 19794  df-abl 19795  df-mgp 20159  df-rng 20171  df-ur 20200  df-ring 20253  df-cring 20254  df-subrng 20564  df-subrg 20588  df-lmod 20898  df-lss 20968  df-assa 21874  df-ascl 21876  df-psr 21930  df-mpl 21932
This theorem is referenced by:  selvascl  33758
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