[petsc-users] TS question 1: how to stop explicit methods because they do not use SNES(VI)?

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
> I see that is it not one-to-one, but its a pattern I think a lot of people
> will want, and one of the most common
> things people ask is "when does implicit beat explicit?". We should think
> about ways to make this easier.

Note that one of the most common splittings is

  u_t - L u = F(u) - L u

The user can have their own option to split or not split, but if we ask
them to break out a bunch of terms, it leads to rather unnatural terms
(subtracting off components that are added back somewhere else).
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