Theorem mdegaddle 23638

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 2610	. . . . . . . . . 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 19263	. . . . . . . . 9 ⊢ (𝜑 → (𝐹 + 𝐺) = (𝐹 ∘𝑓 (+g‘𝑅)𝐺))
8	7	fveq1d 6105	. . . . . . . 8 ⊢ (𝜑 → ((𝐹 + 𝐺)‘𝑐) = ((𝐹 ∘𝑓 (+g‘𝑅)𝐺)‘𝑐))
9	8	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝐹 + 𝐺)‘𝑐) = ((𝐹 ∘𝑓 (+g‘𝑅)𝐺)‘𝑐))
10		eqid 2610	. . . . . . . . . . 11 ⊢ (Base‘𝑅) = (Base‘𝑅)
11		eqid 2610	. . . . . . . . . . 11 ⊢ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin} = {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}
12	1, 10, 2, 11, 5	mplelf 19254	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹:{𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}⟶(Base‘𝑅))
13		ffn 5958	. . . . . . . . . 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 480	. . . . . . . 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 19254	. . . . . . . . . 10 ⊢ (𝜑 → 𝐺:{𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}⟶(Base‘𝑅))
17		ffn 5958	. . . . . . . . . 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 480	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → 𝐺 Fn {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
20		ovex 6577	. . . . . . . . . 10 ⊢ (ℕ0 ↑𝑚 𝐼) ∈ V
21	20	rabex 4740	. . . . . . . . 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 476	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin})
24		fnfvof 6809	. . . . . . . 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 1319	. . . . . . 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 2644	. . . . . 6 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → ((𝐹 + 𝐺)‘𝑐) = ((𝐹‘𝑐)(+g‘𝑅)(𝐺‘𝑐)))
27	26	adantrr 749	. . . . 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 2610	. . . . . . . 8 ⊢ (0g‘𝑅) = (0g‘𝑅)
30		eqid 2610	. . . . . . . 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 480	. . . . . . . 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 790	. . . . . . . 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 23631	. . . . . . . . . . . . 13 ⊢ (𝐹 ∈ 𝐵 → (𝐷‘𝐹) ∈ ℝ*)
34	5, 33	syl 17	. . . . . . . . . . . 12 ⊢ (𝜑 → (𝐷‘𝐹) ∈ ℝ*)
35	34	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → (𝐷‘𝐹) ∈ ℝ*)
36	28, 1, 2	mdegxrcl 23631	. . . . . . . . . . . . . 14 ⊢ (𝐺 ∈ 𝐵 → (𝐷‘𝐺) ∈ ℝ*)
37	6, 36	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → (𝐷‘𝐺) ∈ ℝ*)
38	37, 34	ifcld 4081	. . . . . . . . . . . 12 ⊢ (𝜑 → if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ*)
39	38	adantr 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)) ∈ ℝ*)
40		nn0ssre 11173	. . . . . . . . . . . . 13 ⊢ ℕ0 ⊆ ℝ
41		ressxr 9962	. . . . . . . . . . . . 13 ⊢ ℝ ⊆ ℝ*
42	40, 41	sstri 3577	. . . . . . . . . . . 12 ⊢ ℕ0 ⊆ ℝ*
43		mdegaddle.i	. . . . . . . . . . . . . 14 ⊢ (𝜑 → 𝐼 ∈ 𝑉)
44	11, 30	tdeglem1 23622	. . . . . . . . . . . . . 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 6267	. . . . . . . . . . . 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 3566	. . . . . . . . . . 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 1235	. . . . . . . . . 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 749	. . . . . . . . 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 11880	. . . . . . . . . . . 12 ⊢ (((𝐷‘𝐹) ∈ ℝ* ∧ (𝐷‘𝐺) ∈ ℝ*) → (𝐷‘𝐹) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
51	34, 37, 50	syl2anc 691	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐷‘𝐹) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
52	51	adantr 480	. . . . . . . . . 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 792	. . . . . . . . . 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 553	. . . . . . . . 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 11863	. . . . . . . . 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 63	. . . . . . . 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 23629	. . . . . . 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 480	. . . . . . . 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 480	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑐 ∈ {𝑎 ∈ (ℕ0 ↑𝑚 𝐼) ∣ (◡𝑎 “ ℕ) ∈ Fin}) → (𝐷‘𝐺) ∈ ℝ*)
60	59, 39, 47	3jca 1235	. . . . . . . . . 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 749	. . . . . . . . 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 11881	. . . . . . . . . . . 12 ⊢ (((𝐷‘𝐹) ∈ ℝ* ∧ (𝐷‘𝐺) ∈ ℝ*) → (𝐷‘𝐺) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
63	34, 37, 62	syl2anc 691	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐷‘𝐺) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))
64	63	adantr 480	. . . . . . . . . 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 553	. . . . . . . . 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 11863	. . . . . . . . 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 63	. . . . . . . 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 23629	. . . . . . 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 6567	. . . . . 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 18375	. . . . . . . . 9 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ Grp)
72	70, 71	syl 17	. . . . . . . 8 ⊢ (𝜑 → 𝑅 ∈ Grp)
73	10, 29	ring0cl 18392	. . . . . . . . 9 ⊢ (𝑅 ∈ Ring → (0g‘𝑅) ∈ (Base‘𝑅))
74	70, 73	syl 17	. . . . . . . 8 ⊢ (𝜑 → (0g‘𝑅) ∈ (Base‘𝑅))
75	10, 3, 29	grplid 17275	. . . . . . . 8 ⊢ ((𝑅 ∈ Grp ∧ (0g‘𝑅) ∈ (Base‘𝑅)) → ((0g‘𝑅)(+g‘𝑅)(0g‘𝑅)) = (0g‘𝑅))
76	72, 74, 75	syl2anc 691	. . . . . . 7 ⊢ (𝜑 → ((0g‘𝑅)(+g‘𝑅)(0g‘𝑅)) = (0g‘𝑅))
77	76	adantr 480	. . . . . 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 2644	. . . . 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 2644	. . . 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 641	. . 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 2949	. 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 19273	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑅 ∈ Ring) → 𝑌 ∈ Ring)
83	43, 70, 82	syl2anc 691	. . . 4 ⊢ (𝜑 → 𝑌 ∈ Ring)
84	2, 4	ringacl 18401	. . . 4 ⊢ ((𝑌 ∈ Ring ∧ 𝐹 ∈ 𝐵 ∧ 𝐺 ∈ 𝐵) → (𝐹 + 𝐺) ∈ 𝐵)
85	83, 5, 6, 84	syl3anc 1318	. . 3 ⊢ (𝜑 → (𝐹 + 𝐺) ∈ 𝐵)
86	28, 1, 2, 29, 11, 30	mdegleb 23628	. . 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 691	. 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 246	1 ⊢ (𝜑 → (𝐷‘(𝐹 + 𝐺)) ≤ if((𝐷‘𝐹) ≤ (𝐷‘𝐺), (𝐷‘𝐺), (𝐷‘𝐹)))

Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   ∧ w3a 1031   = wceq 1475   ∈ wcel 1977  ∀wral 2896  {crab 2900  Vcvv 3173  ifcif 4036   class class class wbr 4583   ↦ cmpt 4643  ^◡ccnv 5037   “ cima 5041   Fn wfn 5799  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549   ∘_𝑓 cof 6793   ↑_𝑚 cmap 7744  Fincfn 7841  ℝcr 9814  ℝ^*cxr 9952   < clt 9953   ≤ cle 9954  ℕcn 10897  ℕ₀cn0 11169  Basecbs 15695  +_gcplusg 15768  0_gc0g 15923   Σ_g cgsu 15924  Grpcgrp 17245  Ringcrg 18370   mPoly cmpl 19174  ℂ_fldccnfld 19567   mDeg cmdg 23617

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-inf2 8421  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892  ax-pre-sup 9893  ax-addf 9894  ax-mulf 9895

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-iin 4458  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-se 4998  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-isom 5813  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-of 6795  df-ofr 6796  df-om 6958  df-1st 7059  df-2nd 7060  df-supp 7183  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-2o 7448  df-oadd 7451  df-er 7629  df-map 7746  df-pm 7747  df-ixp 7795  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-fsupp 8159  df-sup 8231  df-oi 8298  df-card 8648  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-3 10957  df-4 10958  df-5 10959  df-6 10960  df-7 10961  df-8 10962  df-9 10963  df-n0 11170  df-z 11255  df-dec 11370  df-uz 11564  df-fz 12198  df-fzo 12335  df-seq 12664  df-hash 12980  df-struct 15697  df-ndx 15698  df-slot 15699  df-base 15700  df-sets 15701  df-ress 15702  df-plusg 15781  df-mulr 15782  df-starv 15783  df-sca 15784  df-vsca 15785  df-tset 15787  df-ple 15788  df-ds 15791  df-unif 15792  df-0g 15925  df-gsum 15926  df-mre 16069  df-mrc 16070  df-acs 16072  df-mgm 17065  df-sgrp 17107  df-mnd 17118  df-mhm 17158  df-submnd 17159  df-grp 17248  df-minusg 17249  df-mulg 17364  df-subg 17414  df-ghm 17481  df-cntz 17573  df-cmn 18018  df-abl 18019  df-mgp 18313  df-ur 18325  df-ring 18372  df-cring 18373  df-subrg 18601  df-psr 19177  df-mpl 19179  df-cnfld 19568  df-mdeg 23619

This theorem is referenced by:  deg1addle  23665