How can I type the underlined symbols in LaTeX? I cannot recognize what letters they are.
\mathscr{S}
\mathscr{T}
mathrsfs
\mathscr{S}and\mathscr{T}according to http://detexify.kirelabs.org/classify.html – leandriis Feb 16 '20 at 11:03mathrsfspackage. – Bernard Feb 16 '20 at 11:05