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April 14th, 2018, 12:24 PM   #1
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Unhappy Can somebody help me?

I can't understand the part with the red arrow, I can't understand how can i get "dj" and "e", and what does "<=>" means , Can somebody help me?


Last edited by Milan135; April 14th, 2018 at 12:30 PM.
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April 14th, 2018, 04:59 PM   #2
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It appears that there is missing context about the constraint that applies to this optimization. It probably is elucidated earlier in the chapter or section from which your selected text is taken.

All that $\lesseqqgtr$ means is that you are to use whatever relationship is specified in your actual problem, whether it is

$\le,\ =,\ \text { or } \ge.$
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