## Notes to Hans Reichenbach

1. It is not entirely clear whether Reichenbach ever was a student of Max Born. Their times in Berlin and Göttingen did not overlap, and Reichenbach does not appear to have officially enrolled in any of Born’s courses (see Padovani 2008, pp. 7–10). Nevertheless, Reichenbach himself counts Born as one of his teachers in autobiographical notes.

2. This notation should be
distinguished from set-theoretic notation. Reichenbach has an
idiosyncratic notation for probability implications. We use (for html
compatibility) “⊃” for Reichenbach’s standard material
implication and “⊇” for his probability implication,
where “⊇_{p}” is a probability
implication with probability *p*.

3. In “Axiomatik der Wahrscheinlichkeitsrechnung” (Reichenbach 1932f) Reichenbach presents his first attempt of an axiomatization of probability.

4. Reichenbach’s axioms are restricted to finite additivity, but van Fraassen convincingly argues that without an extension to countable additivity, much of scientific inference would not be captured. There is a separate question of whether the examples van Fraassen provides are excluded by Reichenbach’s requirements on the sequences that give rise to the probabilities. But even if that is so, the narrower focus is then a weakness of the limiting frequency interpretation.