I have had this problem that I didn't know how to write it properly in this thread.(adsbygoogle = window.adsbygoogle || []).push({});

Let's say I have two objective functions:

Let's say I want 1. as main objective and 2. a sub objective - by that I mean if there is a set of optimal solutions for 1., then final solution can only be from that set and in such a way that it's the best for 2 from all of that set for 1.

- minimize X
- minimize Y

My problem is I don't knowhow to write this down properly.

The only idea I have had so far doesn't work in all cases:

If [itex]0 \leq Y \leq C[/itex] and [itex]C \in \mathbb{R}_{\geq 0}[/itex], then I could rewrite the objective as

minimize X*(C+1) +Y

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# I How to write main and sub objective for optimisation

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