Highly complex mathematical expressions are also possible; for example, the following code<ref>[https://meta.wikimedia.org/wiki/Help:Displaying_a_formula Mediawiki Help:Displaying a Formula]</ref>: | Highly complex mathematical expressions are also possible; for example, the following code<ref>[https://meta.wikimedia.org/wiki/Help:Displaying_a_formula Mediawiki Help:Displaying a Formula]</ref>: |