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Oct 19, 2015 at 3:40 comment added Fan Zheng so in an extremely weak sense it is a finite dimensional free module over the ring of (whatever nice properties you put here) functions.
Oct 4, 2015 at 13:21 comment added user80744 Being hyperbolic as well as elliptic linear ODE are a very exceptional class of PDE.
Oct 2, 2015 at 3:19 history answered Willie Wong CC BY-SA 3.0