SUMS: Ryba -- Differential equations with trees

This week’s SUMS talk is by postgrad Chris Ryba.  Pizza and drinks will as always be
available afterwards.  

Abstract: 
Some differential equations are so messy that they can’t be written down in a
nice form, leaving little hope that their solutions are manageable.  Fortunately, using
the chain rule in clever ways, it turns out that we can find approximate solutions by
counting trees.  It’s even possible to reverse the process and use differential
equations to count particular types of trees.