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No state-space form possible example

• To: mathgroup at smc.vnet.net
• Subject: [mg109237] No state-space form possible example
• From: Virgil Stokes <vs at it.uu.se>
• Date: Sun, 18 Apr 2010 05:59:15 -0400 (EDT)

I am looking for some examples of initial value ordinary differential 
equations that *can not* be put in state-space form.

Any examples would be appreciated, especially ones that can be connected 
to some physical model.

--V. Stokes