In PGML, [``...``] makes display math. But it is not equivalent to the non-PGML
I know that one can put a line break in directly, and use >>...<< to effectively get centered display math.
But for working well with PreTeXt, it would be much better if a direct counterpart to were available. What is the feasibility of making something like [``...``]* (with a star) to achieve that? (And I guess likewise for [:: ... ::]*?)
Alternatively, is there a "clean" way to step outside of PGML temporarily to use something like directly?
because it does not start a new line and center. Instead it seems to just insert \displaymath in front.