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The main objective of interval arithmetic is to provide a simple way of calculating upper and lower bounds of a function's range in one or more variables. These endpoints are not necessarily the true supremum or infimum of a range since the precise calculation of those values can be difficult or impossible; the bounds only need to contain the function's range as a subset.
Number format: ? is now supported when exporting to ODF to represent an integer digit, replaced by blank if it is a non significant zero, and decimals for formats in seconds without truncation like [SS].00 are now accepted; Spreadsheets copied to another document retain a user-defined print range