Degenerate Rectangle
For any non-empty subset, there is a bounded, axis-aligned degenerate rectangle
where and are constant (with for all ). The number of degenerate sides of is the number of elements of the subset . Thus, there may be as few as one degenerate "side" or as many as (in which case reduces to a singleton point).
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“In the Church, considered as a social organism, the mysteries inevitably degenerate into beliefs.”
—Simone Weil (1909–1943)