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Can I know some theories and laws of Operation Research which has being widely used nowadays?

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    $\begingroup$ I agree, and am voting to close. If you can be more specific about what you are looking for, the question can be salvaged. $\endgroup$ – LarrySnyder610 Aug 2 '19 at 15:16
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    $\begingroup$ If it is closed, I will voie to reopen. So the question is broad, so there is not a single unique correct answer. Is that the crime of the century? $\endgroup$ – Mark L. Stone Aug 2 '19 at 15:17
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    $\begingroup$ @MarkL.Stone It is not the crime of the century. It is simply so broad that it's hard to understand what is being asked. Feel free to vote as you find appropriate. $\endgroup$ – LarrySnyder610 Aug 2 '19 at 15:18
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    $\begingroup$ Just the fact that the answers are no longer relevant to the edited question is IMO an indication that the question was broad. i.e. none of the answers posted, answer the edited question of "widely used nowadays but not widely known" $\endgroup$ – EhsanK Aug 2 '19 at 17:56
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    $\begingroup$ Welcome to OR.SE, deepan, and thanks for contributing your first question here. However, in its current state, the scope of the question is too broad - there are very many theories/laws that are widely used; hence the reason it is currently closed. To improve your question, you may wish to focus specifically on particular areas of OR (e.g. linear programming), and ask for some theories there. Alternatively, you may wish to add more specific constraints to your question (e.g. theories that are important to OR but not widely known)? I will vote to reopen once some improvements have been made. $\endgroup$ – TheSimpliFire Aug 4 '19 at 8:51
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Little's Law: $L = \lambda W$. Widely applicable. Widely used.

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How about weak and strong duality?

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