Definition df-bj-zzhat 35363

Description: Definition of the one-point-compactified. (Contributed by BJ, 28-Jul-2023.)

Assertion

Ref	Expression
df-bj-zzhat	⊢ ℤ̂ = (ℤ ∪ {∞})

Detailed syntax breakdown of Definition df-bj-zzhat

Step	Hyp	Ref	Expression
1		czzhat 35362	. 2 class ℤ̂
2		cz 12249	. . 3 class ℤ
3		cinfty 35328	. . . 4 class ∞
4	3	csn 4558	. . 3 class {∞}
5	2, 4	cun 3881	. 2 class (ℤ ∪ {∞})
6	1, 5	wceq 1539	1 wff ℤ̂ = (ℤ ∪ {∞})

This definition is referenced by: (None)