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(both: sĕt or sāt), in Egyptian religion, god of evil. Set was a sun god of predynastic Egypt, but he gradually degenerated from being a beneficent deity into being a god of evil and darkness. In a widespread Egyptian myth he murdered his brother OsirisOsiris
, in Egyptian religion, legendary ruler of predynastic Egypt and god of the underworld. He was the son of the sky goddess Nut and the earth god Geb. The great benefactor of mankind, Osiris brought to the people knowledge of agriculture and civilization.
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 and was in turn defeated by Horus, the son of Osiris. The Greeks identified Set with Typhon.


in mathematics, collection of entities, called elements of the set, that may be real objects or conceptual entities. Set theory not only is involved in many areas of mathematics but has important applications in other fields as well, e.g., computer technology and atomic and nuclear physics.

Definition of Sets

A set must be well defined; i.e., for any given object, it must be unambiguous whether or not the object is an element of the set. For example, if a set contains all the chairs in a designated room, then any chair can be determined either to be in or not in the set. If there were no chairs in the room, the set would be called the empty, or null, set, i.e., one containing no elements. A set is usually designated by a capital letter. If A is the set of even numbers between 1 and 9, then A={2, 4, 6, 8}. The braces, {}, are commonly used to enclose the listed elements of a set. The elements of a set may be described without actually being listed. If B is the set of real numbers that are solutions of the equation x2=9, then the set can be written as B={x:x2=9} or B={x|x2=9}, both of which are read: B is the set of all x such that x2=9; hence B is the set {3,−3}.

Membership in a set is indicated by the symbol ∈ and nonmembership by ∉; thus, xA means that element x is a member of the set A (read simply as "x is a member of A") and yA means y is not a member of A. The symbols ⊂ and ⊃ are used to indicate that one set A is contained within or contains another set B; AB means that A is contained within, or is a subset of, B; and AB means that A contains, or is a superset of, B.

Operations on Sets

There are three basic set operations: intersection, union, and complementation. The intersection of two sets is the set containing the elements common to the two sets and is denoted by the symbol ∩. The union of two sets is the set containing all elements belonging to either one of the sets or to both, denoted by the symbol ∪. Thus, if C={1, 2, 3, 4} and D={3, 4, 5}, then CD={3, 4} and CD={1, 2, 3, 4, 5}. These two operations each obey the associative lawassociative law,
in mathematics, law holding that for a given operation combining three quantities, two at a time, the initial pairing is arbitrary; e.g., using the operation of addition, the numbers 2, 3, and 4 may be combined (2+3)+4=5+4=9 or 2+(3+4)=2+7=9.
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 and the commutative lawcommutative law,
in mathematics, law holding that for a given binary operation (combining two quantities) the order of the quantities is arbitrary; e.g., in addition, the numbers 2 and 5 can be combined as 2+5=7 or as 5+2=7.
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, and together they obey the distributive lawdistributive law.
In mathematics, given any two operations, symbolized by * and +, the first operation, *, is distributive over the second, +, if a*(b+c)=(a*b)+(a*c) for all possible choices of a, b, and c.
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In any discussion the set of all elements under consideration must be specified, and it is called the universal set. If the universal set is U={1, 2, 3, 4, 5} and A={1, 2, 3}, then the complement of A (written A′) is the set of all elements in the universal set that are not in A, or A′={4, 5}. The intersection of a set and its complement is the empty set (denoted by ∅), or AA′=∅; the union of a set and its complement is the universal set, or AA′=U. See also symbolic logicsymbolic logic
or mathematical logic,
formalized system of deductive logic, employing abstract symbols for the various aspects of natural language. Symbolic logic draws on the concepts and techniques of mathematics, notably set theory, and in turn has contributed to
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a young plant raised for subsequent planting in a garden, park, or similar place. Sets of fruit crops are obtained in fruit nurseries; they are usually produced from grafted seedlings (stocks). Sets of berry crops (currant, gooseberry) are one-year-old nongrafted plants. The root suckers of raspberry plants are used as sets. In forestry, sets are young trees that have been raised from seeds or cuttings.



(also Seth), in ancient Egyptian religion and mythology, a god initially venerated in the city of Ombos and whose cult then apparently spread throughout Upper Egypt and the northwest part of the Nile Delta. Set was considered a god of the desert and of foreign countries. According to Egyptian mythology, he was the brother and murderer of Osiris and was subsequently defeated by Horus, the son of Osiris. He was depicted in the form of an unidentifiable animal.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Of a celestial body, to cross the visible western horizon while descending.
The hardening or solidifying of a plastic or liquid substance.
(computer science)
A collection of record types.
The placement of a storage device in a prescribed state, for example, a binary storage cell in the high or 1 state.
A combination of units, assemblies, and parts connected or otherwise used together to perform an operational function, such as a radar set.
In plastics processing, the conversion of a liquid resin or adhesive into a solid state by curing or evaporation of solvent or suspending medium, or by gelling.
Saw teeth bent out of the plane of the saw body, resulting in a wide cut in the workpiece.
A group of essentially conformable strata or cross-strata, separated from other sedimentary units by surfaces of erosion, nondeposition, or abrupt change in character.
(graphic arts)
The fixing or drying of a printing ink on a printed sheet, so that, though not completely dry, the sheet can be handled without smudging.
The hardening or firmness displayed by some materials when left undisturbed.
Permanent deformation of a material, such as metal or plastic, when stressed beyond the elastic limit.
A collection of objects which has the property that, given any thing, it can be determined whether or not the thing is in the collection.
(mining engineering)
The establishment of a course.
The direction toward which an oceanic current flows.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. The condition reached by a cement paste, mortar, or concrete when it has lost plasticity to an arbitrary degree; usually measured in terms of resistance to penetration or deformation; initial set refers to first stiffening, final set to attainment of significant rigidity.
2. The hydration and hardening of a gypsum plaster.
3. To convert a liquid resin or an adhesive to a hardened state by chemical or physical action such as condensation, polymerization, oxidation, vulcanization, gelation, hydration, or the evaporation of volatile constituents.
4.See saw set.
5. In plastering, to apply a finishing coat.
6. To drive a nail below the surface of the wood (with the use of a nail set).
7. The strain remaining after complete release of the load producing a deformation.
8. Collectively, the pieces of scenery that make up a theatrical scene.
9. To coat the back surface of a tile so that it will adhere to the surface to which it is applied.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


1. Maths logic
a. a collection of numbers, objects, etc., that is treated as an entity: {3, the moon} is the set the two members of which are the number 3 and the moon
b. (in some formulations) a class that can itself be a member of other classes
2. any apparatus that receives or transmits television or radio signals
3. Tennis squash badminton one of the units of a match, in tennis one in which one player or pair of players must win at least six games
a. the number of couples required for a formation dance
b. a series of figures that make up a formation dance
a. a band's or performer's concert repertoire on a given occasion
b. a continuous performance
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


Secure Electronic Transaction.






A collection of objects, known as the elements of the set, specified in such a way that we can tell in principle whether or not a given object belongs to it. E.g. the set of all prime numbers, the set of zeros of the cosine function.

For each set there is a predicate (or property) which is true for (possessed by) exactly those objects which are elements of the set. The predicate may be defined by the set or vice versa. Order and repetition of elements within the set are irrelevant so, for example, 1, 2, 3 = 3, 2, 1 = 1, 3, 1, 2, 2.

Some common set of numbers are given the following names:

N = the natural numbers 0, 1, 2, ...

Z = the integers ..., -2, -1, 0, 1, 2, ...

Q = the rational numbers p/q where p, q are in Z and q /= 0.

R = the real numbers

C = the complex numbers.

The empty set is the set with no elements. The intersection of two sets X and Y is the set containing all the elements x such that x is in X and x is in Y. The union of two sets is the set containing all the elements x such that x is in X or x is in Y.

See also set complement.
This article is provided by FOLDOC - Free Online Dictionary of Computing (


(1) An internal DOS/Windows command that sets environment variables, which are stored values used by the operating system and many applications. To display the current values, type:

The set command creates an environment variable and places a value into it. Blank spaces matter. The following examples create NEWVAR with a value of "a."
set newvar=a   create newvar with "a"
  set newvar= a  create newvar with " a"

  set newvar=    delete newvar

(2) (SET) (Secure Electronic Transaction) A standard protocol from MasterCard and Visa for securing online credit card payments via the Internet. In this three-way transaction, the user, merchant and bank must use the SET protocols.

Credit card data and a digital certificate (for authentication) is stored in a plug-in to the user's Web browser. The order is received by a SET-enabled merchant server that passes encrypted payment information to the bank. Approval is electronically sent to the merchant.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
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PS17.60, BIOBU BLUE BAMBOO KIDS TABLEWARE SET: Made with natural materials, this set is designed to be lightweight to be used for babies.
In the first semi-final Zeeshan Zeb recorded victory against Saif Ullah of KP in the three sets battle, the score was 11-2, 11-4 and 11-9.
ii) a semi-open set [12] if A [subset or equal to] cl(int(A)) and a semi-closed set if int (cl(A)) [subset or equal to] A,
The top three best-selling total prestige- fragrance gift sets (women and men combined) during NPD's tracking period were Light Blue 2 piece Spring Set '12, followed by Acqua Di Gio Pour Homme Travel with Style Set '12 and Light Blue Pour Homme Father's Day Set '12.
Shear bands cut set 1 and 2 veins and are categorized under set 3.
Besides the Promoter, other intending shareholders apply for shares to the Promoter, and pay their subscription funds directly to the bank account set up by the Promoter.
When students set their own goals, and are engaged in the goal-setting process, they have the opportunity to reflect on their experiences and develop a higher level of understanding regarding the importance of the activity and how it applies to the attainment of their individual learning goals.
#5 will then circle the interior of the lane and cut off the screen (set by #4) on his way to the opposite block.
In the compression set test, one measures the amount of the unrecovered strain of a sample after it has been compressed a certain amount, and exposed to a particular aging condition.
Example : Let R be the set of Natural Numbers including zero and [empty set] : R [right arrow] [0,1] be a fuzzy subset defined by
In its Enterprise Risk Management--Integrated Framework, the Committee of Sponsoring Organizations of the Treadway Commission (COSO) set a standard for management to manage risk within the entity's risk appetite, as understood and agreed by the board of directors.