Find a way of cutting a circular pizza into finitely many congruent pieces such that at least one piece has no crust.
More formally, find a set of simply connected regions (X1, X2…Xn) such that:
- The intersection (X1 U X2 U… Xn) is the unit disk, D, on ℝ2.
- For each i, j < n there is a rigid, possibly orientation-reversing transformation of the plane which converts Xi to Xj
- For some i, λ(Xi ∩ ∂D) = 0, where λ is the Lebesgue measure*, and ∂D is the boundary of the unit disk, D.
* This Lebesgue measure will be zero if no open or closed interval along the boundary is contained in a slice. That is, a piece that touches the disk’s edge only at its corner(s) is considered to have “no crust”.
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