Problem with DSolve

*To*: mathgroup at smc.vnet.net*Subject*: [mg132147] Problem with DSolve*From*: sam.takoy at yahoo.com*Date*: Fri, 27 Dec 2013 23:27:57 -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

Hi, The following equation has solution f(z) = 1, yet DSolve can't seem to find it: DSolve[{-1 - Derivative[1][f][z]^2 + f[z] (f^\[Prime]\[Prime])[z] == -f[z] (1 + Derivative[1][f][z]^2)^(3/2), f[0] == 1, f[1] == 1}, f, z] I get: DSolve::bvnul: For some branches of the general solution, the given boundary conditions lead to an empty solution. >> DSolve::bvnul: For some branches of the general solution, the given boundary conditions lead to an empty solution. >> Any workaround? Thanks! Sam