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Metamath Proof Explorer

Theorem quotcl2

Description: Closure of the quotient function. (Contributed by Mario Carneiro, 26-Jul-2014)

Ref Expression
Assertion quotcl2 ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) → ( 𝐹 quot 𝐺 ) ∈ ( Poly ‘ ℂ ) )

Proof

Step Hyp Ref Expression
1 addcl ⊢ ( ( 𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ ) → ( 𝑥 + 𝑦 ) ∈ ℂ )
2 1 adantl ⊢ ( ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) ∧ ( 𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ ) ) → ( 𝑥 + 𝑦 ) ∈ ℂ )
3 mulcl ⊢ ( ( 𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ ) → ( 𝑥 · 𝑦 ) ∈ ℂ )
4 3 adantl ⊢ ( ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) ∧ ( 𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ ) ) → ( 𝑥 · 𝑦 ) ∈ ℂ )
5 reccl ⊢ ( ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) → ( 1 / 𝑥 ) ∈ ℂ )
6 5 adantl ⊢ ( ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) ∧ ( 𝑥 ∈ ℂ ∧ 𝑥 ≠ 0 ) ) → ( 1 / 𝑥 ) ∈ ℂ )
7 neg1cn ⊢ - 1 ∈ ℂ
8 7 a1i ⊢ ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) → - 1 ∈ ℂ )
9 plyssc ⊢ ( Poly ‘ 𝑆 ) ⊆ ( Poly ‘ ℂ )
10 simp1 ⊢ ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) → 𝐹 ∈ ( Poly ‘ 𝑆 ) )
11 9 10 sselid ⊢ ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) → 𝐹 ∈ ( Poly ‘ ℂ ) )
12 simp2 ⊢ ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) → 𝐺 ∈ ( Poly ‘ 𝑆 ) )
13 9 12 sselid ⊢ ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) → 𝐺 ∈ ( Poly ‘ ℂ ) )
14 simp3 ⊢ ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) → 𝐺 ≠ 0𝑝 )
15 2 4 6 8 11 13 14 quotcl ⊢ ( ( 𝐹 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ∈ ( Poly ‘ 𝑆 ) ∧ 𝐺 ≠ 0𝑝 ) → ( 𝐹 quot 𝐺 ) ∈ ( Poly ‘ ℂ ) )