Some letters of the greek alphabet include alternative letters. For instance, we have \Phi
, \phi
and \varphi
.
What is the purpose of the variant versions of these letters? Why are these not available for the entire greek alphabet?
Information about these symbols: https://en.wikibooks.org/wiki/LaTeX/Mathematics#Greek_letters. The Comprehensive LaTeX Symbol List from CTAN does not mention their purpose either.