Chance, when strictly examined, is a mere negative word, and means not any real power which has anywhere a being in nature. David Hume (Hume, 2008) [The Deutsch-Wallace theorem] permits what philosophy would hitherto have regarded as a formal impossibility, akin to deriving an ought from an is, namely deriving a probability statement from a factual statement. This could be called deriving a tends to from a does. David Deutsch (Deutsch, 1999) [The Deutsch-Wallace theorem] is a landmark in decision theory. Nothing comparable has been achieved in any chance theory.. .. [It] is little short of a philosophical sensation. .. it shows why credences should conform to [quantum chances]. Simon Saunders (Saunders, 'The Everett interpretation: probability'

Chance, when strictly examined, is a mere negative word, and means not any real power which has anywhere a being in nature. David Hume (Hume, 2008) [The Deutsch-Wallace theorem] permits what philosophy would hitherto have regarded as a formal impossibility, akin to deriving an ought from an is, namely deriving a probability statement from a factual statement. This could be called deriving a tends to from a does. David Deutsch (Deutsch, 1999) [The Deutsch-Wallace theorem] is a landmark in decision theory. Nothing comparable has been achieved in any chance theory.. .. [It] is little short of a philosophical sensation. .. it shows why credences should conform to [quantum chances]. Simon Saunders (Saunders, 'The Everett interpretation: probability'

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