Claim:Cardinality of evens

From CS2800 wiki
Let [math]X := \href{/cs2800/wiki/index.php/Set_comprehension}{\{2n} \href{/cs2800/wiki/index.php/%5Cmid}{\mid} n \href{/cs2800/wiki/index.php/%E2%88%88}{∈} \href{/cs2800/wiki/index.php/%E2%84%95}{ℕ}\} [/math] be the set of even natural numbers. Then [math]│X│ \href{/cs2800/wiki/index.php/Equality_(cardinality)}{=} │ℕ│ [/math].