Analytical solution possible?

*To*: mathgroup at smc.vnet.net*Subject*: [mg131986] Analytical solution possible?*From*: Narasimham <mathma18 at gmail.com>*Date*: Mon, 11 Nov 2013 00:05:52 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net

A numerical solution is possible for the following ODE, but its analytical solution is sought. It goes on indefinitely without indication about inverse functions or messages. Thanks in advance for any suggested workaround. NoISQL = {SI'[t] == (R[t] - a)/(2 a - R[t])/R[t]^2,R'[t] == Cot[SI[t]]/R[t]}; DSolve[NoISQL, {SI, R}, t]; Best Regards Narasimham

**Follow-Ups**:**Re: Analytical solution possible?***From:*Murray Eisenberg <murray@math.umass.edu>