After browsing through related threads, I am now of the understanding (please correct me if I am wrong) that the rule of thumb is to use the
\bigr pair with brackets, parentheses, etc. for operators like sums, products, and integrals, and
\right in all other cases.
I only recently found out about
\middle , which has solved what had been a vexing problem for me: delimiters for function arguments (slashes, bars) not scaling properly. Leafing through my cheatsheet has not been of much help, so I wish to ask: is there an equivalent of
\bigr, or would the use of
\middle along with that pair not be gauche?