Summation / sigma notation in unity

Can anyone tell me if unity has the summation function?
If so what is it called?

greeting,
Sion

Afaik, no. There exists no “Sum” functionality in Unity itself. You can use Linq to use a sum function on arrays as you can see in this thread here:

Stackoverflow link

Apart from that, why not write it yourself? You can even make it a class extension function for Lists/arrays if you are really really keen for that.