Theorem deg1nn0cl

Description: Degree of a nonzero univariate polynomial. (Contributed by Stefan O'Rear, 23-Mar-2015) (Revised by Mario Carneiro, 7-Oct-2015)

	Ref	Expression
Hypotheses	deg1z.d	⊢ 𝐷 = ( deg1 ‘ 𝑅 )
	deg1z.p	⊢ 𝑃 = ( Poly1 ‘ 𝑅 )
	deg1z.z	⊢ 0 = ( 0g ‘ 𝑃 )
	deg1nn0cl.b	⊢ 𝐵 = ( Base ‘ 𝑃 )
Assertion	deg1nn0cl	⊢ ( ( 𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵 ∧ 𝐹 ≠ 0 ) → ( 𝐷 ‘ 𝐹 ) ∈ ℕ0 )

Proof

Step	Hyp	Ref	Expression
1		deg1z.d	⊢ 𝐷 = ( deg1 ‘ 𝑅 )
2		deg1z.p	⊢ 𝑃 = ( Poly1 ‘ 𝑅 )
3		deg1z.z	⊢ 0 = ( 0g ‘ 𝑃 )
4		deg1nn0cl.b	⊢ 𝐵 = ( Base ‘ 𝑃 )
5	1	deg1fval	⊢ 𝐷 = ( 1o mDeg 𝑅 )
6		eqid	⊢ ( 1o mPoly 𝑅 ) = ( 1o mPoly 𝑅 )
7	6 2 3	ply1mpl0	⊢ 0 = ( 0g ‘ ( 1o mPoly 𝑅 ) )
8	2 4	ply1bas	⊢ 𝐵 = ( Base ‘ ( 1o mPoly 𝑅 ) )
9	5 6 7 8	mdegnn0cl	⊢ ( ( 𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵 ∧ 𝐹 ≠ 0 ) → ( 𝐷 ‘ 𝐹 ) ∈ ℕ0 )