= Banach's matchbox problem
{wiki=Banach's_matchbox_problem}
Banach's matchbox problem is a classic problem in measure theory and probability theory that illustrates intriguing ideas about measure, probability, and the structure of sets. The problem is named after the Polish mathematician Stefan Banach. The problem can be stated loosely as follows: 1. **Consider a collection of matches** (or any similar items arranged in a box) that are numbered from 1 to infinity, representing an infinite sequence of distinct elements.
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