Theorem mhpval 20333

Description: Value of the "homogeneous polynomial" function. (Contributed by Steven Nguyen, 25-Aug-2023.)

Hypotheses

Ref	Expression
mhpfval.h	⊢ 𝐻 = (𝐼 mHomP 𝑅)
mhpfval.p	⊢ 𝑃 = (𝐼 mPoly 𝑅)
mhpfval.b	⊢ 𝐵 = (Base‘𝑃)
mhpfval.0	⊢ 0 = (0g‘𝑅)
mhpfval.d	⊢ 𝐷 = {ℎ ∈ (ℕ0 ↑m 𝐼) ∣ (◡ℎ “ ℕ) ∈ Fin}
mhpfval.i	⊢ (𝜑 → 𝐼 ∈ 𝑉)
mhpfval.r	⊢ (𝜑 → 𝑅 ∈ 𝑊)
mhpval.n	⊢ (𝜑 → 𝑁 ∈ ℕ0)

Assertion

Ref	Expression
mhpval	⊢ (𝜑 → (𝐻‘𝑁) = {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁}})

Distinct variable groups:   𝑓,𝑔,ℎ,𝑗   𝑓,𝐼,ℎ   𝑅,𝑓   𝐷,𝑔   𝐵,𝑓   𝑓,𝑁,𝑔

Allowed substitution hints:   𝜑(𝑓,𝑔,ℎ,𝑗)   𝐵(𝑔,ℎ,𝑗)   𝐷(𝑓,ℎ,𝑗)   𝑃(𝑓,𝑔,ℎ,𝑗)   𝑅(𝑔,ℎ,𝑗)   𝐻(𝑓,𝑔,ℎ,𝑗)   𝐼(𝑔,𝑗)   𝑁(ℎ,𝑗)   𝑉(𝑓,𝑔,ℎ,𝑗)   𝑊(𝑓,𝑔,ℎ,𝑗)   0 (𝑓,𝑔,ℎ,𝑗)

Proof of Theorem mhpval

Dummy variable 𝑛 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		mhpfval.h	. . 3 ⊢ 𝐻 = (𝐼 mHomP 𝑅)
2		mhpfval.p	. . 3 ⊢ 𝑃 = (𝐼 mPoly 𝑅)
3		mhpfval.b	. . 3 ⊢ 𝐵 = (Base‘𝑃)
4		mhpfval.0	. . 3 ⊢ 0 = (0g‘𝑅)
5		mhpfval.d	. . 3 ⊢ 𝐷 = {ℎ ∈ (ℕ0 ↑m 𝐼) ∣ (◡ℎ “ ℕ) ∈ Fin}
6		mhpfval.i	. . 3 ⊢ (𝜑 → 𝐼 ∈ 𝑉)
7		mhpfval.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ 𝑊)
8	1, 2, 3, 4, 5, 6, 7	mhpfval 20332	. 2 ⊢ (𝜑 → 𝐻 = (𝑛 ∈ ℕ0 ↦ {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑛}}))
9		eqeq2 2833	. . . . . 6 ⊢ (𝑛 = 𝑁 → (Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑛 ↔ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁))
10	9	rabbidv 3480	. . . . 5 ⊢ (𝑛 = 𝑁 → {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑛} = {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁})
11	10	sseq2d 3999	. . . 4 ⊢ (𝑛 = 𝑁 → ((𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑛} ↔ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁}))
12	11	rabbidv 3480	. . 3 ⊢ (𝑛 = 𝑁 → {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑛}} = {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁}})
13	12	adantl 484	. 2 ⊢ ((𝜑 ∧ 𝑛 = 𝑁) → {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑛}} = {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁}})
14		mhpval.n	. 2 ⊢ (𝜑 → 𝑁 ∈ ℕ0)
15	3	fvexi 6684	. . . 4 ⊢ 𝐵 ∈ V
16	15	rabex 5235	. . 3 ⊢ {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁}} ∈ V
17	16	a1i 11	. 2 ⊢ (𝜑 → {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁}} ∈ V)
18	8, 13, 14, 17	fvmptd 6775	1 ⊢ (𝜑 → (𝐻‘𝑁) = {𝑓 ∈ 𝐵 ∣ (𝑓 supp 0 ) ⊆ {𝑔 ∈ 𝐷 ∣ Σ𝑗 ∈ ℕ0 (𝑔‘𝑗) = 𝑁}})

Syntax hints:   → wi 4   = wceq 1537   ∈ wcel 2114  {crab 3142  Vcvv 3494   ⊆ wss 3936  ^◡ccnv 5554   “ cima 5558  ‘cfv 6355  (class class class)co 7156   supp csupp 7830   ↑_m cmap 8406  Fincfn 8509  ℕcn 11638  ℕ₀cn0 11898  Σcsu 15042  Basecbs 16483  0_gc0g 16713   mPoly cmpl 20133   mHomP cmhp 20322

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-rep 5190  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461  ax-cnex 10593  ax-1cn 10595  ax-addcl 10597

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-pred 6148  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-ov 7159  df-oprab 7160  df-mpo 7161  df-om 7581  df-wrecs 7947  df-recs 8008  df-rdg 8046  df-nn 11639  df-n0 11899  df-mhp 20326

This theorem is referenced by:  ismhp  20334