Theorem vsnid

Description: A setvar variable is a member of its singleton. (Contributed by David A. Wheeler, 8-Dec-2018)

	Ref	Expression
Assertion	vsnid	⊢ 𝑥 ∈ { 𝑥 }

Proof

Step	Hyp	Ref	Expression
1		vex	⊢ 𝑥 ∈ V
2	1	snid	⊢ 𝑥 ∈ { 𝑥 }