Mathematical notation: max of 5 values I have 5 robots and for each new job, one of them finish last. What is the correct notation for getting the maximum of the times of the 5 robots for a job. 
is below acceptable?
$MaxTime = \max\{t_1,t_2,\ldots,t_n\} $ 
Thanks. 
 A: Depending on context, there a number of things you could write (and this list is not exhaustive):
\begin{align}
&\max\{t_1,\ldots,t_n\} \quad\text{ or }\quad \sup\big\{t_1,\ldots,t_n\big\}\\
&\max(t_1,\ldots,t_n)\\
&\max\big(\{t_1,\ldots,t_n\}\big)\\
&\max\big((t_1,\ldots,t_n)\big)\\
&\max\big(\langle t_1,\ldots,t_n\rangle\big)\\
&\max_{i = 1}^{n} t_i \quad\text{ or }\quad \max_{i = 1,\ldots,n} t_i\\
&\max\Big((t_i)_{i = 1,\ldots,t_n}\Big)\\
&\sup\big\{t_i \mid 1 \leq i \leq n\big\}.\\
\end{align}
If you want to complicate things and $t_i \geq 0$, there's also the $p$-norm:
$$\lim_{p \to \infty}\left(\sum_{i = 0}^{n}|t_i|^p\right)^{\frac{1}{p}}.$$
My personal preference is the first or the second from the list, depending on what is more readable in the context.
I hope this helps $\ddot\smile$
Edit:
Please note that the supremum operator $\sup$ is most often used in a context when we don't know or don't care if the maximum is attained by any element it the set, e.g. you cannot write $\max\left\{-\frac{1}{n} \mid n \geq 1\right\}$ because the set does not contain $0$, yet $\sup\left\{-\frac{1}{n} \mid n \geq 1\right\} = 0$. On the other hand, it is certainly not wrong to write $\sup A$ for a finite set $A$ or any other that contains its supremum, and authors often switch between them depending on whether they want to stress or deemphasize that property.
A: You can also write $t_1 \vee \cdots \vee t_n$ (notation from lattice theory) or $t_1 \oplus \cdots \oplus t_n$ (notation used in max-plus theory). 
A: $t_r \in \{t_1, t_2, ..., t_n \} $ s.t. $t_r>t_i \ \ \forall t_i \in \{t_1, t_2, ..., t_n\}\setminus \{t_r\}$. 
