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constraint

{n} compulsion, force, confinement

This term usually refers to the placement of a caveat on the search algorithm, so that it never examines trees that are pre-specified by the user as being unwanted or unlikely Constraint analysis is often used to speed-up the search through tree-space If a search is constrained so that it does not look at improbable relationships (and therefore does not evaluate these topologies), then it might proceed much more quickly On the other hand, constraint analysis might proceed by only finding those trees that are incompatible with the constraint tree (reverse constraint analysis) The latter analysis is used in order to place Decay Indices on the internal branches of a tree

A semantic condition or restriction Certain constraints are predefined in the UML, others may be user defined Constraints are one of three extendibility mechanisms in the UML See: tagged value, stereotype Contrast: note

A limit to the design process Constraints may be such things as appearance, funding, space, materials, and human capabilities

Mandatory requirement to be fulfilled by the designal (design outcome) See also Restriction Examples: "must be manufactured in Australia" "must meet Federal Drug Administration requirements" "must be constructed in stainless steel" There is an important relationship between the design words "objective", "criterion" and "constraint"

something that constrains

A constraint restricts possible occurrences or allowable combinations in relationship sets, interactions, object sets, etc There are Co-occurrence Constraints, Object-set Cardinality Constraints, Participation Constraints, and General Constraints

An SQL constraint is a subobject of a base table that is defined in order to ensure that the actual data complies with the specified conditions Tamino knows four types of constraint: FOREIGN KEY NOT NULL PRIMARY KEY UNIQUE Syntactically, a constraint that refers to a simple column can be defined within a table column element Constraints that refer to more than one column have to be defined by a table constraint element The name of a constraint is unique within the schema, and will be automatically generated if not specified

A semantic condition or restriction Certain constraints are predefined in the UML, others may be user defined Constraints are one of three extensibility mechanisms in UML See tagged value, stereotype

A constraint is any limitation upon a person's prospects They are of two sorts: natural constraints, which are caused by natural law, such as the laws of gravity, entropy, or scarcity, and willed constraints, those which are the result of another's undertaking, such as a physical attack or an embezzlement Willed constraints are themselves of two types: private constraints, which are caused by breaches of duty, and public constraints, which are caused by the actions of law to redress breaches of duty

A condition or proposition that must be maintained as true Constraints are typically applied to the permissible states or operations of an object

A force of some sort restricting the movement of a system In Life studies the variations of form do not allow infinite variation, something restricts the options available Complexity Theory seeks the laws that apply, if any, in these cases and similar areas

A constraint is a limitation For example, in a mixture all of the components must add to 100% This constraint is imposed by nature Some constraints are imposed by the experimenter, such as "the sum of the laser pulses and the laser power must be less than 89 "

the act of constraining; the threat or use of force to control the thoughts or behavior of others

Usually this is a relation of the form of an inequality, g(x) <= 0, or equation, h(x)=0 More generally, it can be any restriction the decision variables must satisfy For example, some regard "x must be integer-valued" as a constraint, while others would say that this is simply the domain of the decision variables in the mathematical program There are other relations, such as the logical form of a precedence constraint: IF x=0 THEN y=0

A restriction among degrees of freedom imposed independently of any applied forces/torques A constraint removes one or more independent degrees of freedom, unless that constraint is redundant and restricts degrees of freedom that otherwise could not move anyway Constraints can also create inconsistencies with the applied forces/torques that lead to simulation errors

A constraint is a relation between two or more scheduling objects In DÉJÀ VU a constraint is projected on a satisfaction degree, a real number between 0 and 1 Constraint types are differentiated and if we consider a certain constraint type in the schedule (e g a compatibility constraint) we speak of a measure or an evaluation function

A component of the logical data model consisting of an arbitrary truth-valued expression which must evaluate to true at transaction boundaries Also, a truth-valued expression used to describe the set of legal values for a scalar type

the state of being physically constrained; "dogs should be kept under restraint"

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