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DSolve doesn't solve easy dif. equation?

• To: mathgroup at smc.vnet.net
• Subject: [mg56045] DSolve doesn't solve easy dif. equation?
• From: "Severin Posta" <severin at lumen.tf.jcu.cz>
• Date: Thu, 14 Apr 2005 08:54:45 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,
when I try to solve

DSolve[(-(64 + 302*z + 744*z^2 + 1389*z^3 + 2043*z^4 + 1887*z^5 + 
1161*z^6 + 624*z^7 + 366*z^8 + 140*z^9 + 28*z^10))*
f11[z] + 9*z*(-2 - 5*z + 5*z^3 + 2*z^4)*(-2 - 10*z - 3*z^2 + 20*z^3 + 
25*z^4 + 18*z^5 + 6*z^6)*Derivative[1][f11][z] +
9*z^2*(-2 - 5*z + 5*z^3 + 2*z^4)*(-2 - 7*z - 7*z^2 + 7*z^4 + 7*z^5 + 
2*z^6)*Derivative[2][f11][z] == 0, f11[z], z]

I get many strange looking messages..?

Why?



Thanx!

Sever.