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| | Cutting a sphere into pieces of larger volume |
 | | We are permitted to cut into finitely many polygons, to translate and rotate the pieces, and to glue along boundaries; then yes, any two equal-area polygons are equi-decomposable. |
 | | Using the axiom of choice on non-countable sets, you can prove that a solid sphere can be dissected into a finite number of pieces that can be reassembled to two solid spheres, each of same volume of the original. |
 | | This result is, nowadays, trivial, and is the standard example of a non-measurable set, taught in a beginning graduate class on measure theory. |
| www.cs.uwaterloo.ca /~alopez-o/math-faq/node70.html (753 words) |
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