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2. Allen's interval algebra - Wikipedia

   en.wikipedia.org/wiki/Allen's_Interval_Algebra

   Java library implementing Allen's Interval Algebra (incl. data and index structures, e.g., interval tree) OWL-Time Time Ontology in OWL an OWL-2 DL ontology of temporal concepts, for describing the temporal properties of resources in the world or described in Web pages. GQR is a reasoner for Allen's interval algebra (and many others)

3. Interval (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Interval_(mathematics)

   For example, the set of real numbers consisting of 0, 1, and all numbers in between is an interval, denoted [0, 1] and called the unit interval; the set of all positive real numbers is an interval, denoted (0, ∞); the set of all real numbers is an interval, denoted (−∞, ∞); and any single real number a is an interval, denoted [a, a].

4. Interval arithmetic - Wikipedia

   en.wikipedia.org/wiki/Interval_arithmetic

   A comprehensive paper on interval algebra in numerical analysis was published by Teruo Sunaga (1958). [11] The birth of modern interval arithmetic was marked by the appearance of the book Interval Analysis by Ramon E. Moore in 1966. [12] [13] He had the idea in spring 1958, and a year later he published an article about computer interval ...

5. Table of mathematical symbols by introduction date - Wikipedia

   en.wikipedia.org/wiki/Table_of_mathematical...

   Download as PDF; Printable version; In other projects ... See History of algebra: The symbol x. 1637 [2] ... (for function notation) 1936 (to denote images of ...

6. Indicator function - Wikipedia

   en.wikipedia.org/wiki/Indicator_function

   The notation is also used to denote the characteristic function in convex analysis, which is defined as if using the reciprocal of the standard definition of the indicator function. A related concept in statistics is that of a dummy variable .

7. Glossary of mathematical symbols - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_mathematical...

   This notation has also been used for other variants of floor and ceiling functions. 4. Iverson bracket: if P is a predicate, [] may denote the Iverson bracket, that is the function that takes the value 1 for the values of the free variables in P for which P is true, and takes the value 0 otherwise.