Theorem mdegaddle 23834

Description: The degree of a sum is at most the maximum of the degrees of the factors. (Contributed by Stefan O'Rear, 26-Mar-2015.)

Hypotheses

Ref	Expression
mdegaddle.y	⊢ 𝑌 = (𝐼 mPoly 𝑅)
mdegaddle.d	⊢ 𝐷 = (𝐼 mDeg 𝑅)
mdegaddle.i	⊢ (𝜑 → 𝐼 ∈ 𝑉)
mdegaddle.r	⊢ (𝜑 → 𝑅 ∈ Ring)
mdegaddle.b	⊢ 𝐵 = (Base‘𝑌)
mdegaddle.p	⊢ + = (+g‘𝑌)
mdegaddle.f	⊢ (𝜑 → 𝐹 ∈ 𝐵)
mdegaddle.g	⊢ (𝜑 → 𝐺 ∈ 𝐵)

Assertion

Ref	Expression
mdegaddle	⊢ (𝜑 → (𝐷‘(𝐹 + 𝐺)) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))

Proof of Theorem mdegaddle

Dummy variables 𝑐 𝑎 𝑏 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		mdegaddle.y	. . . . . . . . . 10 ⊢ 𝑌 = (𝐼 mPoly 𝑅)
2		mdegaddle.b	. . . . . . . . . 10 ⊢ 𝐵 = (Base‘𝑌)
3		eqid 2622	. . . . . . . . . 10 ⊢ (+g‘𝑅) = (+g‘𝑅)
4		mdegaddle.p	. . . . . . . . . 10 ⊢ + = (+g‘𝑌)
5		mdegaddle.f	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹 ∈ 𝐵)
6		mdegaddle.g	. . . . . . . . . 10 ⊢ (𝜑 → 𝐺 ∈ 𝐵)
7	1, 2, 3, 4, 5, 6	mpladd 19442	. . . . . . . . 9 ⊢ (𝜑 → (𝐹 + 𝐺) = (𝐹 ∘𝑓 (+g‘𝑅)𝐺))
8	7	fveq1d 6193	. . . . . . . 8 ⊢ (𝜑 → ((𝐹 + 𝐺)‘𝑐) = ((𝐹 ∘𝑓 (+g‘𝑅)𝐺)‘𝑐))
9	8	adantr 481	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝐹 + 𝐺)‘𝑐) = ((𝐹 ∘𝑓 (+g‘𝑅)𝐺)‘𝑐))
10		eqid 2622	. . . . . . . . . . 11 ⊢ (Base‘𝑅) = (Base‘𝑅)
11		eqid 2622	. . . . . . . . . . 11 ⊢ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} = {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}
12	1, 10, 2, 11, 5	mplelf 19433	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹:{𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}⟶(Base‘𝑅))
13		ffn 6045	. . . . . . . . . 10 ⊢ (𝐹:{𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}⟶(Base‘𝑅) → 𝐹 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
14	12, 13	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
15	14	adantr 481	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → 𝐹 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
16	1, 10, 2, 11, 6	mplelf 19433	. . . . . . . . . 10 ⊢ (𝜑 → 𝐺:{𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}⟶(Base‘𝑅))
17		ffn 6045	. . . . . . . . . 10 ⊢ (𝐺:{𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}⟶(Base‘𝑅) → 𝐺 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
18	16, 17	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝐺 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
19	18	adantr 481	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → 𝐺 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
20		ovex 6678	. . . . . . . . . 10 ⊢ (ℕ0 ↑𝑚 𝐼) ∈ V
21	20	rabex 4813	. . . . . . . . 9 ⊢ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∈ V
22	21	a1i 11	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∈ V)
23		simpr 477	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
24		fnfvof 6911	. . . . . . . 8 ⊢ (((𝐹 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ 𝐺 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) ∧ ({𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∈ V ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})) → ((𝐹 ∘𝑓 (+g‘𝑅)𝐺)‘𝑐) = ((𝐹‘𝑐)(+g‘𝑅)(𝐺‘𝑐)))
25	15, 19, 22, 23, 24	syl22anc 1327	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝐹 ∘𝑓 (+g‘𝑅)𝐺)‘𝑐) = ((𝐹‘𝑐)(+g‘𝑅)(𝐺‘𝑐)))
26	9, 25	eqtrd 2656	. . . . . 6 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝐹 + 𝐺)‘𝑐) = ((𝐹‘𝑐)(+g‘𝑅)(𝐺‘𝑐)))
27	26	adantrr 753	. . . . 5 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((𝐹 + 𝐺)‘𝑐) = ((𝐹‘𝑐)(+g‘𝑅)(𝐺‘𝑐)))
28		mdegaddle.d	. . . . . . . 8 ⊢ 𝐷 = (𝐼 mDeg 𝑅)
29		eqid 2622	. . . . . . . 8 ⊢ (0g‘𝑅) = (0g‘𝑅)
30		eqid 2622	. . . . . . . 8 ⊢ (𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏)) = (𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))
31	5	adantr 481	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → 𝐹 ∈ 𝐵)
32		simprl 794	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
33	28, 1, 2	mdegxrcl 23827	. . . . . . . . . . . . 13 ⊢ (𝐹 ∈ 𝐵 → (𝐷‘𝐹) ∈ ℝ*)
34	5, 33	syl 17	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐷‘𝐹) ∈ ℝ*)
35	34	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → (𝐷‘𝐹) ∈ ℝ*)
36	28, 1, 2	mdegxrcl 23827	. . . . . . . . . . . . . 14 ⊢ (𝐺 ∈ 𝐵 → (𝐷‘𝐺) ∈ ℝ*)
37	6, 36	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝐷‘𝐺) ∈ ℝ*)
38	37, 34	ifcld 4131	. . . . . . . . . . . 12 ⊢ (𝜑 → if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ*)
39	38	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ*)
40		nn0ssre 11296	. . . . . . . . . . . . 13 ⊢ ℕ0 ⊆ ℝ
41		ressxr 10083	. . . . . . . . . . . . 13 ⊢ ℝ ⊆ ℝ*
42	40, 41	sstri 3612	. . . . . . . . . . . 12 ⊢ ℕ0 ⊆ ℝ*
43		mdegaddle.i	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝐼 ∈ 𝑉)
44	11, 30	tdeglem1 23818	. . . . . . . . . . . . . 14 ⊢ (𝐼 ∈ 𝑉 → (𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏)):{𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}⟶ℕ0)
45	43, 44	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏)):{𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}⟶ℕ0)
46	45	ffvelrnda 6359	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) ∈ ℕ0)
47	42, 46	sseldi 3601	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) ∈ ℝ*)
48	35, 39, 47	3jca 1242	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝐷‘𝐹) ∈ ℝ* ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ* ∧ ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) ∈ ℝ*))
49	48	adantrr 753	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((𝐷‘𝐹) ∈ ℝ* ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ* ∧ ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) ∈ ℝ*))
50		xrmax1 12006	. . . . . . . . . . . 12 ⊢ (((𝐷‘𝐹) ∈ ℝ* ∧ (𝐷‘𝐺) ∈ ℝ*) → (𝐷‘𝐹) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
51	34, 37, 50	syl2anc 693	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐷‘𝐹) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
52	51	adantr 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → (𝐷‘𝐹) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
53		simprr 796	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))
54	52, 53	jca 554	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((𝐷‘𝐹) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐)))
55		xrlelttr 11987	. . . . . . . . 9 ⊢ (((𝐷‘𝐹) ∈ ℝ* ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ* ∧ ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) ∈ ℝ*) → (((𝐷‘𝐹) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐)) → (𝐷‘𝐹) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐)))
56	49, 54, 55	sylc 65	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → (𝐷‘𝐹) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))
57	28, 1, 2, 29, 11, 30, 31, 32, 56	mdeglt 23825	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → (𝐹‘𝑐) = (0g‘𝑅))
58	6	adantr 481	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → 𝐺 ∈ 𝐵)
59	37	adantr 481	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → (𝐷‘𝐺) ∈ ℝ*)
60	59, 39, 47	3jca 1242	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝐷‘𝐺) ∈ ℝ* ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ* ∧ ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) ∈ ℝ*))
61	60	adantrr 753	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((𝐷‘𝐺) ∈ ℝ* ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ* ∧ ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) ∈ ℝ*))
62		xrmax2 12007	. . . . . . . . . . . 12 ⊢ (((𝐷‘𝐹) ∈ ℝ* ∧ (𝐷‘𝐺) ∈ ℝ*) → (𝐷‘𝐺) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
63	34, 37, 62	syl2anc 693	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐷‘𝐺) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
64	63	adantr 481	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → (𝐷‘𝐺) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
65	64, 53	jca 554	. . . . . . . . 9 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((𝐷‘𝐺) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐)))
66		xrlelttr 11987	. . . . . . . . 9 ⊢ (((𝐷‘𝐺) ∈ ℝ* ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ* ∧ ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) ∈ ℝ*) → (((𝐷‘𝐺) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐)) → (𝐷‘𝐺) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐)))
67	61, 65, 66	sylc 65	. . . . . . . 8 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → (𝐷‘𝐺) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))
68	28, 1, 2, 29, 11, 30, 58, 32, 67	mdeglt 23825	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → (𝐺‘𝑐) = (0g‘𝑅))
69	57, 68	oveq12d 6668	. . . . . 6 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((𝐹‘𝑐)(+g‘𝑅)(𝐺‘𝑐)) = ((0g‘𝑅)(+g‘𝑅)(0g‘𝑅)))
70		mdegaddle.r	. . . . . . . . 9 ⊢ (𝜑 → 𝑅 ∈ Ring)
71		ringgrp 18552	. . . . . . . . 9 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Grp)
72	70, 71	syl 17	. . . . . . . 8 ⊢ (𝜑 → 𝑅 ∈ Grp)
73	10, 29	ring0cl 18569	. . . . . . . . 9 ⊢ (𝑅 ∈ Ring → (0g‘𝑅) ∈ (Base‘𝑅))
74	70, 73	syl 17	. . . . . . . 8 ⊢ (𝜑 → (0g‘𝑅) ∈ (Base‘𝑅))
75	10, 3, 29	grplid 17452	. . . . . . . 8 ⊢ ((𝑅 ∈ Grp ∧ (0g‘𝑅) ∈ (Base‘𝑅)) → ((0g‘𝑅)(+g‘𝑅)(0g‘𝑅)) = (0g‘𝑅))
76	72, 74, 75	syl2anc 693	. . . . . . 7 ⊢ (𝜑 → ((0g‘𝑅)(+g‘𝑅)(0g‘𝑅)) = (0g‘𝑅))
77	76	adantr 481	. . . . . 6 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((0g‘𝑅)(+g‘𝑅)(0g‘𝑅)) = (0g‘𝑅))
78	69, 77	eqtrd 2656	. . . . 5 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((𝐹‘𝑐)(+g‘𝑅)(𝐺‘𝑐)) = (0g‘𝑅))
79	27, 78	eqtrd 2656	. . . 4 ⊢ ((𝜑 ∧ (𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐))) → ((𝐹 + 𝐺)‘𝑐) = (0g‘𝑅))
80	79	expr 643	. . 3 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → (if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) → ((𝐹 + 𝐺)‘𝑐) = (0g‘𝑅)))
81	80	ralrimiva 2966	. 2 ⊢ (𝜑 → ∀𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} (if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) → ((𝐹 + 𝐺)‘𝑐) = (0g‘𝑅)))
82	1	mplring 19452	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑅 ∈ Ring) → 𝑌 ∈ Ring)
83	43, 70, 82	syl2anc 693	. . . 4 ⊢ (𝜑 → 𝑌 ∈ Ring)
84	2, 4	ringacl 18578	. . . 4 ⊢ ((𝑌 ∈ Ring ∧ 𝐹 ∈ 𝐵 ∧ 𝐺 ∈ 𝐵) → (𝐹 + 𝐺) ∈ 𝐵)
85	83, 5, 6, 84	syl3anc 1326	. . 3 ⊢ (𝜑 → (𝐹 + 𝐺) ∈ 𝐵)
86	28, 1, 2, 29, 11, 30	mdegleb 23824	. . 3 ⊢ (((𝐹 + 𝐺) ∈ 𝐵 ∧ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ*) → ((𝐷‘(𝐹 + 𝐺)) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ↔ ∀𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} (if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) → ((𝐹 + 𝐺)‘𝑐) = (0g‘𝑅))))
87	85, 38, 86	syl2anc 693	. 2 ⊢ (𝜑 → ((𝐷‘(𝐹 + 𝐺)) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ↔ ∀𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} (if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) < ((𝑏 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} ↦ (ℂfld Σg 𝑏))‘𝑐) → ((𝐹 + 𝐺)‘𝑐) = (0g‘𝑅))))
88	81, 87	mpbird 247	1 ⊢ (𝜑 → (𝐷‘(𝐹 + 𝐺)) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))

Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   ∧ w3a 1037   = wceq 1483   ∈ wcel 1990  ∀wral 2912  {crab 2916  Vcvv 3200  ifcif 4086   class class class wbr 4653   ↦ cmpt 4729  ^◡ccnv 5113   “ cima 5117   Fn wfn 5883  ⟶wf 5884  ‘cfv 5888  (class class class)co 6650   ∘_𝑓 cof 6895   ↑_𝑚 cmap 7857  Fincfn 7955  ℝcr 9935  ℝ^*cxr 10073   < clt 10074   ≤ cle 10075  ℕcn 11020  ℕ₀cn0 11292  Basecbs 15857  +_gcplusg 15941  0_gc0g 16100   Σ_g cgsu 16101  Grpcgrp 17422  Ringcrg 18547   mPoly cmpl 19353  ℂ_fldccnfld 19746   mDeg cmdg 23813

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-inf2 8538  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013  ax-pre-sup 10014  ax-addf 10015  ax-mulf 10016

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-iin 4523  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-se 5074  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-isom 5897  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-of 6897  df-ofr 6898  df-om 7066  df-1st 7168  df-2nd 7169  df-supp 7296  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-2o 7561  df-oadd 7564  df-er 7742  df-map 7859  df-pm 7860  df-ixp 7909  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-fsupp 8276  df-sup 8348  df-oi 8415  df-card 8765  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-3 11080  df-4 11081  df-5 11082  df-6 11083  df-7 11084  df-8 11085  df-9 11086  df-n0 11293  df-z 11378  df-dec 11494  df-uz 11688  df-fz 12327  df-fzo 12466  df-seq 12802  df-hash 13118  df-struct 15859  df-ndx 15860  df-slot 15861  df-base 15863  df-sets 15864  df-ress 15865  df-plusg 15954  df-mulr 15955  df-starv 15956  df-sca 15957  df-vsca 15958  df-tset 15960  df-ple 15961  df-ds 15964  df-unif 15965  df-0g 16102  df-gsum 16103  df-mre 16246  df-mrc 16247  df-acs 16249  df-mgm 17242  df-sgrp 17284  df-mnd 17295  df-mhm 17335  df-submnd 17336  df-grp 17425  df-minusg 17426  df-mulg 17541  df-subg 17591  df-ghm 17658  df-cntz 17750  df-cmn 18195  df-abl 18196  df-mgp 18490  df-ur 18502  df-ring 18549  df-cring 18550  df-subrg 18778  df-psr 19356  df-mpl 19358  df-cnfld 19747  df-mdeg 23815

This theorem is referenced by:  deg1addle  23861