The word discrete comes from the 15th Century
Latin word discretus which means separate. It is used with different meanings in different contexts:In
perception, a discrete entity is something that can be perceived individually and not as connected to, or part of something else.In
topology, a branch of mathematics, a
discrete space is a
topological space in which all sets are
open, and a discrete set is a set of
isolated points.In
discrete mathematics, without notion of continuity, a discrete set is a
countable set; this concept is also important for
combinatorics,
probability theory, and
statistical theory.In
statistics a discrete random variable defines a particular type of
variable in a
discrete probability distribution (in contrast to a
continuous random variable).In
discrete mathematics and in
theoretical computer science, the abstract world is usually modeled as a
discrete space with
discrete time.In
electrical engineering and
electronic engineering, discrete means having separate
electronic components, such as individual resistors and
inductors. This is the opposite of
integrated circuitry.In
audio engineering, discrete means having separate and independent
channels of
audio, as opposed to
matrixed
quadraphonic,
stereo or other multi-channel sound.A
discrete signal in information theory and signal processingIn music, a discrete
pitch is one with a steady frequency, rather than an indiscrete gliding,
glissando or
portamento, pitch.In
project management, discrete effort is any activity with a pre-defined state of completion; the opposite of discrete effort is continuous, operational or ongoing effort.
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