My Math Forum Can somebody help me?

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 April 14th, 2018, 12:24 PM #1 Newbie   Joined: Apr 2018 From: Private Posts: 1 Thanks: 0 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.
 April 14th, 2018, 04:59 PM #2 Senior Member   Joined: May 2016 From: USA Posts: 1,148 Thanks: 479 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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