Theorem ringridmd

Description: The unit element of a ring is a right multiplicative identity. (Contributed by SN, 14-Aug-2024)

	Ref	Expression
Hypotheses	ringridmd.b	$$⊢B={\mathrm{Base}}_R$$
	ringridmd.t	$$⊢\underset{\dot{}}{·}={\cdot }_R$$
	ringridmd.u	$$⊢\underset{\dot{}}{1}=1_R$$
	ringridmd.r	$$⊢\phi \to R\in \mathrm{Ring}$$
	ringridmd.x	$$⊢\phi \to X\in B$$
Assertion	ringridmd	$$⊢\phi \to X\underset{\dot{}}{·}\underset{\dot{}}{1}=X$$

Proof

Step	Hyp	Ref	Expression
1		ringridmd.b	$$⊢B={\mathrm{Base}}_R$$
2		ringridmd.t	$$⊢\underset{\dot{}}{·}={\cdot }_R$$
3		ringridmd.u	$$⊢\underset{\dot{}}{1}=1_R$$
4		ringridmd.r	$$⊢\phi \to R\in \mathrm{Ring}$$
5		ringridmd.x	$$⊢\phi \to X\in B$$
6	1 2 3	ringridm	$$⊢\left(R\in \mathrm{Ring}\wedge X\in B\right)\to X\underset{\dot{}}{·}\underset{\dot{}}{1}=X$$
7	4 5 6	syl2anc	$$⊢\phi \to X\underset{\dot{}}{·}\underset{\dot{}}{1}=X$$