[Libmesh-users] elem_solution_derivative

[Truman E. <tr...@ic...>]

I am working through example 18, and I came across an odd assert. Line
432 of naviersystem.C says:
libmesh_assert (c.elem_solution_derivative == 1.0);
I don't understand while it is important or even valid to assert this.

Any explanation would be helpful.
Thanks,
Truman