Theorem rp-abid

Description: Two ways to express a class. (Contributed by RP, 13-Feb-2025)

	Ref	Expression
Assertion	rp-abid	$$⊢A=\left\{x|\exists a\in Ax=a\right\}$$

Proof

Step	Hyp	Ref	Expression
1		clel5	$$⊢x\in A\leftrightarrow \exists a\in Ax=a$$
2	1	eqabi	$$⊢A=\left\{x|\exists a\in Ax=a\right\}$$