4
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What are the symbols that look like an up arrow and a down arrow?

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  • $\begingroup$ Maximum and minimum. $\endgroup$ – Mariano Suárez-Álvarez Jan 15 '17 at 5:01
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    $\begingroup$ Up is min, down is max. $\endgroup$ – Ian Jan 15 '17 at 5:03
  • $\begingroup$ So it is, (k-1) or 4, whichever is the minimum? $\endgroup$ – Kior Jan 15 '17 at 5:08
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    $\begingroup$ @Kior $a\wedge b=\min\{a,b\}$ and $a\vee b=\max\{a,b\}$. $\endgroup$ – Masacroso Jan 15 '17 at 5:19
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    $\begingroup$ These should be answers, not comments. $\endgroup$ – AlgorithmsX Jan 15 '17 at 5:35
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The expression $a∧b$= $\min(a,b)$ while $a∨b$=$\max(a,b)$. Therefore, the given summation is from $i=(k-4)$ or $1$ whichever is maximum to $i=(k-1)$ or $4$ , whichever is minimum.

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    $\begingroup$ FYI, $\wedge \vee \max \min$ gives $\wedge \vee \max \min$ $\endgroup$ – user14972 Jan 15 '17 at 6:25

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