Mathematica 9 is now available
Technology Guide--The Technology Inside Matters
Subsystem Autoseparation
Subsystem Autoseparation

In some cases it is advantageous to split a system of differential equations into subsystems so that each can be solved with the most appropriate symbolic or numeric method. When you manually specify a splitting method and composition, Mathematica automatically splits the equations and recombines them for you.

Mathematica is unique among mainstream technical computing systems in supporting such separation.

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