 i result)))))


http://www.tweedledum.com/rwg/idents.htm

A sum of Bessels wherein the
argument and subscript both ramp with the index is called a Kapteyn series.  The
alternate text if you roll over the formula with IE is "Continued cosine, A036778"
which is the sequence number (q.v.) of its expansion coefficients in Sloane's
Encyclopedia, http://akpublic.research.att.com/~njas/sequences/ .  I think the
iterated cosine stops converging near z = 1.42, where it begins a period 2
oscillation, presumably with