category-theory-presentation/categories/20_What/060_Category_laws_neutral_element.html
2013-02-28 16:49:12 +01:00

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<h2>Category laws: neutral element</h2>
<p>for each object \(X\), there is an \(\id_X:X→X\),<br/>
such that for each \(f:A→B\):</p>
<img src="categories/img/mp/identity.png" alt="identity"/>