#### Document Type

Article

#### Publication Date

2013

#### Keywords

Probabilistic theory (PT), quantum mechanics

#### Abstract

We define an index of compatibility for a probabilistic theory (PT). Quantum mechanics with index 0 and classical probability theory with index 1 are at the two extremes. In this way, quantum mechanics is at least as incompatible as any PT. We consider a PT called a concrete quantum logic that may have compatibility index strictly between 0 and 1, but we have not been able to show this yet. Finally, we show that observables in a PT can be represented by positive, vector-valued measures.

#### Recommended Citation

Gudder, Stan, "Compatibility for Probabilistic Theories" (2013). *Mathematics Preprint Series.* Paper 23.

http://digitalcommons.du.edu/math_preprints/23