[bvw]

I didn’t.

[grey_whiskers]

Well, you mentioned Einstein, so that means Minkowski space.

And I didn't *think* you meant Hilbert space, as that refers (more or less) to computational methodology (e.g. complete sets, choice of basis).

So to my mind, that left supersymmetry and branes.

My apologies for misunderstanding.

Can you flesh out your point for those of us without a clue?

Cheers!