Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > df-even | Structured version Visualization version GIF version |
Description: Define the set of even numbers. (Contributed by AV, 14-Jun-2020.) |
Ref | Expression |
---|---|
df-even | ⊢ Even = {𝑧 ∈ ℤ ∣ (𝑧 / 2) ∈ ℤ} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ceven 40075 | . 2 class Even | |
2 | vz | . . . . . 6 setvar 𝑧 | |
3 | 2 | cv 1474 | . . . . 5 class 𝑧 |
4 | c2 10947 | . . . . 5 class 2 | |
5 | cdiv 10563 | . . . . 5 class / | |
6 | 3, 4, 5 | co 6549 | . . . 4 class (𝑧 / 2) |
7 | cz 11254 | . . . 4 class ℤ | |
8 | 6, 7 | wcel 1977 | . . 3 wff (𝑧 / 2) ∈ ℤ |
9 | 8, 2, 7 | crab 2900 | . 2 class {𝑧 ∈ ℤ ∣ (𝑧 / 2) ∈ ℤ} |
10 | 1, 9 | wceq 1475 | 1 wff Even = {𝑧 ∈ ℤ ∣ (𝑧 / 2) ∈ ℤ} |
Colors of variables: wff setvar class |
This definition is referenced by: iseven 40079 dfeven4 40089 dfeven3 40108 |
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