# What is the symbol that looks like an up arrow?

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

• Maximum and minimum. – Mariano Suárez-Álvarez Jan 15 '17 at 5:01
• Up is min, down is max. – Ian Jan 15 '17 at 5:03
• So it is, (k-1) or 4, whichever is the minimum? – Betty Jan 15 '17 at 5:08
• @Kior $a\wedge b=\min\{a,b\}$ and $a\vee b=\max\{a,b\}$. – Masacroso Jan 15 '17 at 5:19
• These should be answers, not comments. – AlgorithmsX Jan 15 '17 at 5:35

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