Theorem psdval

Description: Evaluate the partial derivative of a power series F with respect to X . (Contributed by SN, 11-Apr-2025)

	Ref	Expression
Hypotheses	psdval.s	⊢ 𝑆 = ( 𝐼 mPwSer 𝑅 )
	psdval.b	⊢ 𝐵 = ( Base ‘ 𝑆 )
	psdval.d	⊢ 𝐷 = { ℎ ∈ ( ℕ0 ↑m 𝐼 ) ∣ ( ◡ ℎ “ ℕ ) ∈ Fin }
	psdval.x	⊢ ( 𝜑 → 𝑋 ∈ 𝐼 )
	psdval.f	⊢ ( 𝜑 → 𝐹 ∈ 𝐵 )
Assertion	psdval	⊢ ( 𝜑 → ( ( ( 𝐼 mPSDer 𝑅 ) ‘ 𝑋 ) ‘ 𝐹 ) = ( 𝑘 ∈ 𝐷 ↦ ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝐹 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) ) )

Proof

Step	Hyp	Ref	Expression
1		psdval.s	⊢ 𝑆 = ( 𝐼 mPwSer 𝑅 )
2		psdval.b	⊢ 𝐵 = ( Base ‘ 𝑆 )
3		psdval.d	⊢ 𝐷 = { ℎ ∈ ( ℕ0 ↑m 𝐼 ) ∣ ( ◡ ℎ “ ℕ ) ∈ Fin }
4		psdval.x	⊢ ( 𝜑 → 𝑋 ∈ 𝐼 )
5		psdval.f	⊢ ( 𝜑 → 𝐹 ∈ 𝐵 )
6		fveq1	⊢ ( 𝑓 = 𝐹 → ( 𝑓 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) = ( 𝐹 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) )
7	6	oveq2d	⊢ ( 𝑓 = 𝐹 → ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝑓 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) = ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝐹 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) )
8	7	mpteq2dv	⊢ ( 𝑓 = 𝐹 → ( 𝑘 ∈ 𝐷 ↦ ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝑓 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) ) = ( 𝑘 ∈ 𝐷 ↦ ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝐹 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) ) )
9		reldmpsr	⊢ Rel dom mPwSer
10	9 1 2	elbasov	⊢ ( 𝐹 ∈ 𝐵 → ( 𝐼 ∈ V ∧ 𝑅 ∈ V ) )
11	5 10	syl	⊢ ( 𝜑 → ( 𝐼 ∈ V ∧ 𝑅 ∈ V ) )
12	11	simpld	⊢ ( 𝜑 → 𝐼 ∈ V )
13	11	simprd	⊢ ( 𝜑 → 𝑅 ∈ V )
14	1 2 3 12 13 4	psdfval	⊢ ( 𝜑 → ( ( 𝐼 mPSDer 𝑅 ) ‘ 𝑋 ) = ( 𝑓 ∈ 𝐵 ↦ ( 𝑘 ∈ 𝐷 ↦ ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝑓 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) ) ) )
15		ovex	⊢ ( ℕ0 ↑m 𝐼 ) ∈ V
16	3 15	rabex2	⊢ 𝐷 ∈ V
17	16	mptex	⊢ ( 𝑘 ∈ 𝐷 ↦ ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝐹 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) ) ∈ V
18	17	a1i	⊢ ( 𝜑 → ( 𝑘 ∈ 𝐷 ↦ ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝐹 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) ) ∈ V )
19	8 14 5 18	fvmptd4	⊢ ( 𝜑 → ( ( ( 𝐼 mPSDer 𝑅 ) ‘ 𝑋 ) ‘ 𝐹 ) = ( 𝑘 ∈ 𝐷 ↦ ( ( ( 𝑘 ‘ 𝑋 ) + 1 ) ( .g ‘ 𝑅 ) ( 𝐹 ‘ ( 𝑘 ∘f + ( 𝑦 ∈ 𝐼 ↦ if ( 𝑦 = 𝑋 , 1 , 0 ) ) ) ) ) ) )