chain model), so basing the timestep on the unfolding probability at
the current tension is dangerous, and we need to search for a $dt$ for
which $P_N(F(x+v*dt))<P_\text{max}$ (See Section
-\ref{sec.transtion_rate} for a discussion of $P_N$). There are two
+\ref{sec.transition_rate} for a discussion of $P_N$). There are two
cases to consider. In the most common, no domains have unfolded since
the last step, and we expect the next step to be slightly shorter than
the previous one. In the less common, domains did unfold in the last