[Help-glpk] What is the preference between a CHECK and a CONSTRAINT?

[Harley Mackenzie]

I have been developing some MathProg models using GLPK 4.1 and I am confused to 
the difference between a check and a constraint. Although a check is defined as 
a logical test only rather than a numerical bound obviously there would be some 
overlap in some cases and a validation could take either form.

Is it better to use either one or is the difference immaterial?

Regards,

Harley
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