Theorem mat1f

Description: There is a function from a ring to the ring of matrices with dimension 1 over this ring. (Contributed by AV, 22-Dec-2019)

	Ref	Expression
Hypotheses	mat1rhmval.k	⊢ 𝐾 = ( Base ‘ 𝑅 )
	mat1rhmval.a	⊢ 𝐴 = ( { 𝐸 } Mat 𝑅 )
	mat1rhmval.b	⊢ 𝐵 = ( Base ‘ 𝐴 )
	mat1rhmval.o	⊢ 𝑂 = ⟨ 𝐸 , 𝐸 ⟩
	mat1rhmval.f	⊢ 𝐹 = ( 𝑥 ∈ 𝐾 ↦ { ⟨ 𝑂 , 𝑥 ⟩ } )
Assertion	mat1f	⊢ ( ( 𝑅 ∈ Ring ∧ 𝐸 ∈ 𝑉 ) → 𝐹 : 𝐾 ⟶ 𝐵 )

Proof

Step	Hyp	Ref	Expression
1		mat1rhmval.k	⊢ 𝐾 = ( Base ‘ 𝑅 )
2		mat1rhmval.a	⊢ 𝐴 = ( { 𝐸 } Mat 𝑅 )
3		mat1rhmval.b	⊢ 𝐵 = ( Base ‘ 𝐴 )
4		mat1rhmval.o	⊢ 𝑂 = ⟨ 𝐸 , 𝐸 ⟩
5		mat1rhmval.f	⊢ 𝐹 = ( 𝑥 ∈ 𝐾 ↦ { ⟨ 𝑂 , 𝑥 ⟩ } )
6	1 2 3 4 5	mat1f1o	⊢ ( ( 𝑅 ∈ Ring ∧ 𝐸 ∈ 𝑉 ) → 𝐹 : 𝐾 –1-1-onto→ 𝐵 )
7		f1of	⊢ ( 𝐹 : 𝐾 –1-1-onto→ 𝐵 → 𝐹 : 𝐾 ⟶ 𝐵 )
8	6 7	syl	⊢ ( ( 𝑅 ∈ Ring ∧ 𝐸 ∈ 𝑉 ) → 𝐹 : 𝐾 ⟶ 𝐵 )