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On Oct 1 2012, Vincent Lefevre wrote:
Not everyone agrees on what a closed interval is (except for bounded intervals of real numbers, which match the topological definition of closed set). So, this notion should be avoided for unbounded intervals.
As this originated only in a minor comment of mine, it doesn't matter, but obviously I agree that it should be avoided in documents without making it clear exactly what is meant. Regards, Nick Maclaren.