Complex

A complex is a whole that comprehends a number of intricate parts, especially one with interconnected or mutually related parts; for example, a complex of buildings.

Complex may refer to:

Biology

 * Multiprotein complex, a group of two or more associated polypeptide chains
 * Complex (taxonomy), in biology, a cluster of species so closely related that they intergrade, can interbreed, and are difficult to firmly distinguish except at the extremes of their ranges
 * Mimicry complex, a complex system of organisms and dependencies involved in a case of mimicry

Chemistry

 * Coordination complex, also called a "coordination compound" or "metal complex", a structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules (ligands)
 * Chelate complex, a coordination complex with more than one bond

Mathematics

 * Complex number, an extension of real numbers obtained by adjoining imaginary numbers
 * Complex system, a system of interconnected simple parts that together exhibit a high degree of computational complexity from which emerges a higher order behavior
 * Complex analysis, the study of functions of complex numbers
 * An element of a complex algebra or field of sets
 * Chain complex, a (possibly long) sequence of maps
 * Simplicial complex, a kind of topological space that can be divided into fully adjacent triangles, or more generally, into simplices
 * CW complex, or closure-finite weak complex, a kind of topological space, a generalization of the simplicial complex
 * Line complex, a 3-dimensional family of lines in space

Other scientific uses

 * Complex (psychology), a group of mental factors that are unconsciously associated by the individual with a particular subject and influence the individual's attitude and behavior
 * Synonym for a complex system which generally includes all interactions between elements
 * Complex crater, a type of large impact crater morphology

As a name

 * Complex (magazine), a young men's style/lifestyle magazine
 * CoMPLEX (ucl) is an interdisciplinary centre at University College London into biology and biomedicine
 * CompLex (software dictionary), Computer Lexicon by AND Software, Merriam-Webster's Collegiate Dictionary and Thesaurus, 10th edition (1993), issued as retail version on CD-ROM in 1995 for Windows 95/98, version 2.5E42 runs fine in Windows XP if the selected standard printer's driver is compatible, otherwise generates a fatal error message.
 * Complex (artist), an American Rap artist
 * Complex (band), a Japanese rock band
 * "Complex" (song), a song by British musician Gary Numan