Let f be defined by the series for all x where the series converges
A. What is the domain
B. Is f odd, even or neither
C. Assuming that derivatives can be computed term by term show that f'' = f
You in Leache's class?
Anyway, for A domain should be infinity.
I haven't found an answer for B (could be neither)
and for C http://www.math.sunysb.edu/~disconzi...ging_index.pdf