Fitch's paradox of knowability is one of the fundamental puzzles of epistemic logic , proposed by Frederic Fitch in 1963.

The paradox contradicts the widely accepted knowability thesis, which states that any truth is, in principle, knowable. It concludes instead, that there are some truths that it is not possible to know.

External links

• Fitch's Paradox of Knowability. Article at the Stanford Encyclopedia of Philosophy, by Berit Brogaard and Joe Salerno.
• Not Every Truth Can Be Known: at least, not all at once. Discussion page on an article of the same name by Greg Restall .