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## Re: [Help-glpk] Conditions for glpsol

**From**: |
Michael Hennebry |

**Subject**: |
Re: [Help-glpk] Conditions for glpsol |

**Date**: |
Thu, 24 May 2012 12:34:58 -0500 (CDT) |

**User-agent**: |
Alpine 1.00 (DEB 882 2007-12-20) |

On Thu, 24 May 2012, esma mehiaoui wrote:

Could somebody tell me how to express the following condition in a linear
constraint ?
if A = 1 and B = 1 then C = 1

`if A = 1 and B = 0 then C = 0
``if A = 0 and B = 1 then C = 0
``if A = 0 and B = 0 then C = 0
``
`Ps: just for precision it is not a logical AND the difference is that in my
case i should to have the value zero for C if A or B or both are equal to 0.

I'm not sure what distinction you are drawing here.
Supposing (A, B, C) has precisely four allowed values:
The convex hull is a simplex. It has four facets.
C>=0
C<=A
C<=B
C>=A+B-1
A, B integer

`All the best
``Esma
`

This is where your PS would go.
--
Michael address@hidden
"On Monday, I'm gonna have to tell my kindergarten class,
whom I teach not to run with scissors,
that my fiance ran me through with a broadsword." -- Lily