Tarski's circle-squaring problem

Tarski's circle-squaring problem is the challenge, posed by Alfred Tarski in 1925,^[1] to take a disc in the plane, cut it into finitely many pieces, and reassemble the pieces so as to get a square of equal area. It is possible, using pieces that are Borel sets, but not with pieces cut by Jordan curves.

^ Cite error: The named reference tarski was invoked but never defined (see the help page).

[tarski-1] Cite error: The named reference tarski was invoked but never defined (see the help page).

[1]