Definition:Complex


 * Complex Analysis: the realm of mathematics which explores the properties of functions of complex numbers.


 * In abstract algebra and in particularly group theory, a complex is another word for a subset product.


 * In group theory, a complex is another word for a subset of a group.


 * In homological algebra a differential complex is another word for a null sequence.


 * A word that is used (against recommendation) in imprecise writing and natural language to have the vague meaning complicated, as opposed to simple.