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# bland rule

This is for pivot selection
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# binding constraint

A constraint whose removal changes the optimality region
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# decision variable

A decision variable represents a problem entity for which a choice must be made. For instance, a decision variable might represent the position of a queen on a chessboard, for which there are 100 different possibilities (choices) on a 10x10 chessboard or the start time of an activity in a scheduling problem. Each possible choice is represented by a [..]
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# decomposition principle

The idea of decomposing a mathematical program into two or more sets of variables and associated constraints. The purpose is to separate some portion with special structure from the rest of the mathematical program.
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# decoupling principle

Arises in sensitivity analysis
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# degeneracy

The solution to the primal-dual pair of linear programs
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# degeneracy graph

An undirected graph
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# degenerate polyhedron

See Degeneracy
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# degree-2 inequality

Arises in mixed integer linear programming
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# degree of difficulty

See geometric program
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