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The STIX Fonts project or Scientific and Technical Information Exchange (STIX), is a project sponsored by several leading scientific and technical publishers to provide, under royalty-free license, a comprehensive font set of mathematical symbols and alphabets, intended to serve the scientific and engineering community for electronic and print publication.
In mathematics, an operation is a function from a set to itself. For example, an operation on real numbers will take in real numbers and return a real number. An operation can take zero or more input values (also called "operands" or "arguments") to a well-defined output value.
There are four elementary arithmetic operations in mathematics: addition (+), subtraction (−), multiplication (×), and division (÷). [4] Lagrange's four-square theorem states that every positive integer can be written as the sum of at most four squares. [5] [6] Four is one of four all-Harshad numbers.
The order of operations, that is, the order in which the operations in an expression are usually performed, results from a convention adopted throughout mathematics, science, technology and many computer programming languages. It is summarized as: [2] [5] Parentheses; Exponentiation; Multiplication and division; Addition and subtraction
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The Unicode Standard encodes almost all standard characters used in mathematics. [1] Unicode Technical Report #25 provides comprehensive information about the character repertoire, their properties, and guidelines for implementation. [1]
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Mathematical OpenType typefaces have significant coverage of the symbols defined in the Unicode Technical Report #25 (Unicode Support for Mathematics), and provide advanced layout features using the MATH OpenType table and math OpenType script supported by Office 2007. They have been added to the ISO OpenType standard in April 2014 .