When searching about PDE, I sometimes see the word "energy method". I want to know this method but there is no wikipedia page about it.
Is there a good web page or book about this topic?
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Suppose we have a parabolic PDE, says. Basically we exploit the structure of the PDE to create an energy-like functional $E(t)$ that is non-increasing over time, giving a priori estimate for important quantities (like $L^2$ norm) of the solution $u$ of our PDE. This can be used to prove uniqueness and other properties of $u$.