assigned numbers


The RFC STD 2 documenting the currently assigned values from several series of numbers used in network protocol implementations. This RFC is updated periodically and, in any case, current information can be obtained from the Internet Assigned Numbers Authority (IANA). If you are developing a protocol or application that will require the use of a link, socket, port, protocol, etc., you should contact the IANA to receive a number assignment.

Last updated: 1996-08-19



Storing the value of an expression in a variable. This is commonly written in the form "v = e". In Algol the assignment operator was ":=" (pronounced "becomes") to avoid mathematicians qualms about writing statements like x = x+1.

Assignment is not allowed in functional languages, where an identifier always has the same value.

See also referential transparency, single assignment, zero assignment.

Last updated: 1996-08-19

assignment problem

<mathematics, algorithm>

(Or "linear assignment") Any problem involving minimising the sum of C(a, b) over a set P of pairs (a, b) where a is an element of some set A and b is an element of set B, and C is some function, under constraints such as "each element of A must appear exactly once in P" or similarly for B, or both.

For example, the a's could be workers and the b's projects.

The problem is "linear" because the "cost function" C() depends only on the particular pairing (a, b) and is independent of all other pairings.


Last updated: 1999-07-12

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