ehoogeboom / e3_diffusion_for_molecules

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Question about the paper #8

Closed Frankie123421 closed 1 year ago

Frankie123421 commented 1 year ago

Hi, I am studying your nice work these days. And I am confused with a little bit foolish question: the paper mentioned that "it is impossible to have a non-zero distribution that is invariant to translations, since it cannot integrate to one", could you please explain further mathematically on why it cannot integrate to one?

ehoogeboom commented 1 year ago

Hi,

Let’s consider a 1d example. We meant that if p(x + t) = p(x), then it is constant so when we let p(x) = c then:

integral-infty^+infty p(x) = integral-infty^+infty c Which can either equal zero or tend towards plus/minus infinity.

Frankie123421 commented 1 year ago

Thanks for your kind reply. I got it.