One Fact a Day: Raven paradox

The raven paradox, also known as Hempel's paradox, is a paradox arising from the question of what constitutes evidence for a statement.

Observing objects that are neither black nor ravens may formally increase the likelihood that all ravens are black even though, intuitively, these observations are unrelated.

This problem was proposed by the logician Carl Gustav Hempel in the 1940s to illustrate a contradiction between inductive logic and intuition.

Source: https://en.wikipedia.org/wiki/Raven_paradox

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