I always struggle to remember when a function is convex and concave:
Do you have a particular trick to help you remember this?
My trick is based on the Spanish phrase "No cabe", pronounced
nô ˈka.βe, which sound just like "concave". "No cabe" means it does not fit. Thus, whilst you can put something into a convex function (e.g. think of a bowl), you cannot put something into a concave function. Hence the relation.
I am curious on what other, perhaps more efficient methods people use.