I'm not entirely sure I know what you want. Does the following file do it?
Paul
#LyX 2.0 created this file. For more info see http://www.lyx.org/
\lyxformat 413
\begin_document
\begin_header
\textclass article
\use_default_options true
\maintain_unincluded_children false
\language english
\langua
Hi,
I'm having difficulties creating an binomial option tree. The tree is
fine, however, LYX refuses to let me create two lines on top of each
other at the nodes. All fractions and \underset work, but I would like
the entries (S_0u / f_u) to be equally sized in two lines at each node
witho
