[Doktorander] Quick question

Hi all,

If you have a minute (I swear it can be done in a minute), I have a quick question:

Could you name three to five (mathematical) concepts that come up in your every day research? It can be common, it can also be super specific, as long as this is something you use a lot.

Answer here: https://forms.gle/SUQukBkncim8FMHY7

The form is anonymous and the data will be used to answer some interesting (I hope) questions later on.

Best, Luka