I have an association matrix $n\times n$ where the values are either $0$ or $1$. So this matrix is called $B$ and $b(ij)$ is either $0$ or $1$ . However when $i=0$ this means something and if $i>0$ it means something else. How can I express this in a mathematical model?
2026-03-05 16:39:30.1772728770
How to represent a decision variable?
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