About thirty years ago, in a practice GRE (Graduate Record Exam) math
test in the US,
a question assumed the student knew the definition of the [Wronskian](https://en.wikipedia.org/wiki/Wronskian). I had never heard of this determinant
before.

> 
> ***Q***. Is this still assumed to be part of what a student heading toward
> a graduate degree in mathematics knows?
> 
> 
>