Can existence outside of the physical world be defined and discussed?

[selfAdjoint]

See Feynmans quantum mechanics interpretation of the particle duality

Where can I see it?

 

[Ernies]

As Wittgenstein discusses, only the physical can be discussed. The meta-physical cannot. Therefore a discussion of existence outside the logical space of existence is not something that can be defined in order to be considered.

What on Earth does the first sentence mean? Simply that this is Wittgenstein's definition of discussion? Is mmarko agreeing with that?
If so how can one discuss mathematics, music and so on? I can easily find a definition of Zemelo's theorem, but find it impossible to do the equivalent with, say, Chopin's Prelude No. 17. I can discuss both, but neither are to my mind physical.

Wittgenstein may or may not have been a genius, but he never got over his theory of maths being ignored at a conference in 1930 by preference for Godel. This gave him a fanatical bias against unending processes, and ultimately restricted him to discussing the physical. The kindest opinion I have heard of his maths theory is 'naive'

Ernies