At the moment, Mathematics SE has tags hessian-matrix and jacobian. However, tag gradient is a synonym for tag vector-analysis. Why?
Motivation
Since tag gradient does not exist, tags gradient-descent and gradient-flows are often used instead, which is unfortunate. Two tags are being corrupted because tag gradient does not exist. E.g.,
Moreover, there are dozens (if not hundreds) of duplicates of the following question.
Find the gradient of the scalar field $f : \Bbb R^n \to \Bbb R$ defined by $f ({\bf x}) := {\bf x}^\top {\bf A} \, {\bf x}$.
Over the past year, I found some 30 duplicates. There may be many, many more. I suspect it would be easier to find such duplicates if gradient existed as a non-synonym.
Related
hessian is:question
returns some 2k16 results. Still too ambitious. I would be happy if I could easily and quickly find duplicates amongst the questions I have already answered. Which is why I have started appending a list of tags to some answers of mine. Forget past questions. I would focus on properly tagging future posts, ideally so that many of them can be closed as duplicates. Answering the same question under different guises 100s of times seems quite Sisyphean to me. $\endgroup$