Theorem bj-ccssccbar

Description: Complex numbers are extended complex numbers. (Contributed by BJ, 27-Jun-2019)

	Ref	Expression
Assertion	bj-ccssccbar	⊢ ℂ ⊆ ℂ̅

Proof

Step	Hyp	Ref	Expression
1		ssun1	⊢ ℂ ⊆ ( ℂ ∪ ℂ∞ )
2		df-bj-ccbar	⊢ ℂ̅ = ( ℂ ∪ ℂ∞ )
3	1 2	sseqtrri	⊢ ℂ ⊆ ℂ̅