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

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    Maximum and minimum. – 2017-01-15
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    Up is min, down is max. – 2017-01-15
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    So it is, (k-1) or 4, whichever is the minimum? – 2017-01-15
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    @Kior $a\wedge b=\min\{a,b\}$ and $a\vee b=\max\{a,b\}$. – 2017-01-15
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    These should be answers, not comments. – 2017-01-15
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    There are lots of competing meanings, including And and Or, depending on the context. – 2017-01-15

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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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    FYI, `$\wedge \vee \max \min$` gives $\wedge \vee \max \min$ – 2017-01-15