- #1

greypilgrim

- 447

- 28

I'm trying to grasp what the PBR theorem is about. I'm not tackling the full version, but rather the simple example in @Demystifier's summary.

While I think I understand the mathematical steps, my question is why you need

**two**systems to prove it. Is this only technical or more fundamental?

I mean it's not that surprising for a no-go theorem to make use of a bipartite system, but the crucial thing about that, such as in Bell's theorem, usually is that those systems are entangled. Here they just seem to be in a product state.