# Peng GUO

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## Activity overview

Latest activity by Peng GUO
• Peng GUO commented,

Hi,  You are right. But I am trying to tighten the upper bound for speeding up the solution process. If the UB=10 and $$\epsilon=1$$, $$Z=9$$ for next iteration by using $$Z\leq UB-\epsilon$$. But ...

• Peng GUO created a post,

### how to obtain the solution information of sub-problem when using callback

Dear all, Currently, I am trying to implement a Benders Decomposition. I can add a lazy constraint to limint the binary variables of the master problem. I can obtain the optimal solution of the mas...