"Many concepts in math also appear in physics."
Translation:Nhiều khái niệm môn toán cũng xuất hiện trong môn vật lý.
I think the DL team either forgot to use "trong" or they meant to say "mathematical concepts" for the English sentence. Your understanding of the language is just fine Raymondo.
It's just a short form, not very precise. You should add "Trong". "Ở" is not suitable.