Definition df-even 47613

Description: Define the set of even numbers. (Contributed by AV, 14-Jun-2020.)

Assertion

Ref	Expression
df-even	⊢ Even = {𝑧 ∈ ℤ ∣ (𝑧 / 2) ∈ ℤ}

Detailed syntax breakdown of Definition df-even

Step	Hyp	Ref	Expression
1		ceven 47611	. 2 class Even
2		vz	. . . . . 6 setvar 𝑧
3	2	cv 1539	. . . . 5 class 𝑧
4		c2 12321	. . . . 5 class 2
5		cdiv 11920	. . . . 5 class /
6	3, 4, 5	co 7431	. . . 4 class (𝑧 / 2)
7		cz 12613	. . . 4 class ℤ
8	6, 7	wcel 2108	. . 3 wff (𝑧 / 2) ∈ ℤ
9	8, 2, 7	crab 3436	. 2 class {𝑧 ∈ ℤ ∣ (𝑧 / 2) ∈ ℤ}
10	1, 9	wceq 1540	1 wff Even = {𝑧 ∈ ℤ ∣ (𝑧 / 2) ∈ ℤ}

This definition is referenced by:  iseven  47615  dfeven4  47625  dfeven3  47645