Interpolation of Infinitely Many Points

[l'Hôpital]

This sort of came up the other day:

Given a sequence of monotonically decreasing points, a_n, such that a_n \rightarrow 0 does there exist an analytic f on ℝ such that

<br /> f(n) = a_n<br />

?

I figured there should be some sort interpolation theory on this, but I haven't found anything yet.

Thanks!

 

[micromass]

See http://mathworld.wolfram.com/RamanujansInterpolationFormula.html or http://mathworld.wolfram.com/RamanujansMasterTheorem.html

The mathworld article isn't very rigorous though and doesn't give the conditions under which this is allowed. So you might want to find a better source.