1. 
   Complementary variables
   If u and v are the two vectors that satisfy complementary slackness, each pair, u_i and v_i are called complementary variables. In linear programming, primal levels and dual prices are complementary variables.
   Found op http://glossary.computing.society.informs.org/index.php?page=C.html
   
   
2. 
   Complex variables
   In mathematics, the term complex variables may be taken to mean one of ...
   Found op http://en.wikipedia.org/wiki/Complex_variables
   
   
3. 
   Complicating variables
   Those variables which, when fixed at particular values, render the remaining mathematical program relatively easy to solve. One example is the use of binary variables for fixed charges in an otherwise linear program. More generally, see Benders' decomposition.
   Found op http://glossary.computing.society.informs.org/index.php?page=C.html
   
   
4. 
   Confounding Variables
   These are variables that if anticipated could be controlled in an experimental situation. If they are not controlled they can give rise to an alternative explanation of results. Examples of confounding variables would be situational variables and participant variables.
   Found op http://www.gerardkeegan.co.uk/glossary/gloss_a.htm
   
   
5. 
   Conjugate variables
   [thermodynamics] In thermodynamics, the internal energy of a system is expressed in terms of pairs of conjugate variables such as temperature/entropy or pressure/volume. In fact all thermodynamic potentials are expressed in terms of conjugate pairs. For a mechanical system, a small increment...
   Found op http://en.wikipedia.org/wiki/Conjugate_variables_(thermodynamics)
   
   
6. 
   Conjugate variables
   Conjugate variables are pairs of variables mathematically defined in such a way that they become Fourier transform duals of one-another, or more generally are related through Pontryagin duality. The duality relations lead naturally to an uncertainty in physics called the Heisenberg uncertainty prin...
   Found op http://en.wikipedia.org/wiki/Conjugate_variables
   
   
7. 
   Control variables
   KFC Restaurant in Trnava (Galéria Tesco), Slovakia ...
   Found op http://en.wikipedia.org/wiki/Control_variables
   
   

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