(mathematics, stochastic processes) A square matrix whose rows consist of nonnegative real numbers, with each row summing to 1. Used to describe the transitions of a Markov chain; its element in the ith row and jth column describes the probability of moving from state i to state j in one time step.

(biology) A framework of fibers extending throughout the nucleus of a cell.

(biology) The material within the space, enclosed by the mitochondrial inner membrane. It is composed of enzymes, DNA filaments, granules, protein crystals, glycogen, and lipid.

(linear algebra) A square matrix A with complex entries that is equal to its own conjugate transpose, i.e., such that A=A^†.

(mathematics) A matrix whose entries are all zero.

(linear algebra) A matrix which when multiplied by its conjugate transpose yields the identity matrix.

(linear algebra) A square matrix which is not invertible.

plural of identity matrix

(physics) Abbreviation of Cabibbo-Kobayashi-Maskawa matrix.

A type of organizational management in which people with similar skills are pooled for work assignments and may have more than one manager.