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Metamath Proof Explorer

Theorem opsrcrng

Description: The ring of ordered power series is commutative ring. (Contributed by Mario Carneiro, 10-Jan-2015)

Ref Expression
Hypotheses opsrcrng.o ⊢ 𝑂 = ( ( 𝐼 ordPwSer 𝑅 ) ‘ 𝑇 )
opsrcrng.i ⊢ ( 𝜑 → 𝐼 ∈ 𝑉 )
opsrcrng.r ⊢ ( 𝜑 → 𝑅 ∈ CRing )
opsrcrng.t ⊢ ( 𝜑 → 𝑇 ⊆ ( 𝐼 × 𝐼 ) )
Assertion opsrcrng ( 𝜑 → 𝑂 ∈ CRing )

Proof

Step Hyp Ref Expression
1 opsrcrng.o ⊢ 𝑂 = ( ( 𝐼 ordPwSer 𝑅 ) ‘ 𝑇 )
2 opsrcrng.i ⊢ ( 𝜑 → 𝐼 ∈ 𝑉 )
3 opsrcrng.r ⊢ ( 𝜑 → 𝑅 ∈ CRing )
4 opsrcrng.t ⊢ ( 𝜑 → 𝑇 ⊆ ( 𝐼 × 𝐼 ) )
5 eqid ⊢ ( 𝐼 mPwSer 𝑅 ) = ( 𝐼 mPwSer 𝑅 )
6 5 2 3 psrcrng ⊢ ( 𝜑 → ( 𝐼 mPwSer 𝑅 ) ∈ CRing )
7 eqidd ⊢ ( 𝜑 → ( Base ‘ ( 𝐼 mPwSer 𝑅 ) ) = ( Base ‘ ( 𝐼 mPwSer 𝑅 ) ) )
8 5 1 4 opsrbas ⊢ ( 𝜑 → ( Base ‘ ( 𝐼 mPwSer 𝑅 ) ) = ( Base ‘ 𝑂 ) )
9 5 1 4 opsrplusg ⊢ ( 𝜑 → ( +g ‘ ( 𝐼 mPwSer 𝑅 ) ) = ( +g ‘ 𝑂 ) )
10 9 oveqdr ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ( Base ‘ ( 𝐼 mPwSer 𝑅 ) ) ∧ 𝑦 ∈ ( Base ‘ ( 𝐼 mPwSer 𝑅 ) ) ) ) → ( 𝑥 ( +g ‘ ( 𝐼 mPwSer 𝑅 ) ) 𝑦 ) = ( 𝑥 ( +g ‘ 𝑂 ) 𝑦 ) )
11 5 1 4 opsrmulr ⊢ ( 𝜑 → ( .r ‘ ( 𝐼 mPwSer 𝑅 ) ) = ( .r ‘ 𝑂 ) )
12 11 oveqdr ⊢ ( ( 𝜑 ∧ ( 𝑥 ∈ ( Base ‘ ( 𝐼 mPwSer 𝑅 ) ) ∧ 𝑦 ∈ ( Base ‘ ( 𝐼 mPwSer 𝑅 ) ) ) ) → ( 𝑥 ( .r ‘ ( 𝐼 mPwSer 𝑅 ) ) 𝑦 ) = ( 𝑥 ( .r ‘ 𝑂 ) 𝑦 ) )
13 7 8 10 12 crngpropd ⊢ ( 𝜑 → ( ( 𝐼 mPwSer 𝑅 ) ∈ CRing ↔ 𝑂 ∈ CRing ) )
14 6 13 mpbid ⊢ ( 𝜑 → 𝑂 ∈ CRing )