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It supplies commonly used math symbols that are not present in the Symbol font. Visit www.dessci.com for details.http://www.dessci.comCopyright (c) Design Science, Inc, 1999-2001.MT ExtraRegularDesign Science: MT Extra: 4.3Version 4.30 (January 2001)MT-ExtraMT Extra and MathType are trademarks of Design Science, Inc.Design Science, IncMike Evans, Paul Topping, Jim KingMT Extra is supplied with MathType and Equation Editor, software applications for the editing of mathematical notation. It supplies commonly used math symbols that are not present in the Symbol font. 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