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1 definitions retrieved:
The Free On-line Dictionary of Computing (18 March 2015):
A branch of mathematics introduced by Dana Scott in
1970 as a mathematical theory of programming languages, and
for nearly a quarter of a century developed almost exclusively
in connection with denotational semantics in computer
In denotational semantics of programming languages, the
meaning of a program is taken to be an element of a domain. A
domain is a mathematical structure consisting of a set of
values (or "points") and an ordering relation, <= on those
values. Domain theory is the study of such structures.
("<=" is written in LaTeX as \subseteq)
Different domains correspond to the different types of object
with which a program deals. In a language containing
functions, we might have a domain X -> Y which is the set of
functions from domain X to domain Y with the ordering f <= g
iff for all x in X, f x <= g x. In the pure lambda-calculus
all objects are functions or applications of functions to
other functions. To represent the meaning of such programs,
we must solve the recursive equation over domains,
D = D -> D
which states that domain D is (isomorphic to) some function
space from D to itself. I.e. it is a fixed point D = F(D)
for some operator F that takes a domain D to D -> D. The
equivalent equation has no non-trivial solution in set
There are many definitions of domains, with different
properties and suitable for different purposes. One commonly
used definition is that of Scott domains, often simply called
domains, which are omega-algebraic, consistently completeCPOs.
There are domain-theoretic computational models in other
branches of mathematics including dynamical systems,
fractals, measure theory, integration theory,
probability theory, and stochastic processes.
See also abstract interpretation, bottom, pointed