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The rule is symmetry.
If {} then {__}.
If {} then {__}.
The discussion centers on the properties of closed intervals with infinite endpoints, specifically the intervals (-∞, b] and [a, ∞). Participants argue that these intervals are closed because they contain all their limit points. The conversation highlights the definitions of closed sets in real analysis, emphasizing that sequences converging within these intervals must converge to points within the intervals themselves. The debate also touches on the implications of using infinity in mathematical contexts, asserting that symbols like +∞ and -∞ serve as notational conveniences rather than actual real numbers.
PREREQUISITESMathematicians, students of real analysis, and anyone interested in the foundational concepts of topology and interval properties in mathematics.