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# What if I don't like what Jesus says?

#### Sun, Sep 16th

It's funny how different backgrounds bring you to having different ideas of what is easy and hard. As a mathematician, to me the easy problem is finding the minimum of the functional (where "easy" means "we can at least try", certainly not "trivial"; some minimum problems are actually relatively easy, some others are very difficult and open), while proving existence of PDEs is exactly why calculus of variations (and many other theories) were invented in the first place.

They clearly aren't, especially when it comes to proving some sort of formal property about them (which is something a mathematician would worry about, but which is rarely an engineer's first concern: they'd only worry about that type of thing when numerical integration starts producing "crazy" results).