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+Language eXtensions for Scientific Computation provide all features
+indispensable for modern numerical software development, such as :
+ - Operator concept (user-defined operators)
+ - Overloading concept
+ - Module concept
+ - Dynamic arrays
+ - Controlled rounding
+ - Predefined arithmetic data types real, (extended real), complex,
+ interval, complex interval, and corresponding vector and matrix types
+ - Predefined arithmetic operators of highest accuracy for the arithmetic
+ data types
+ - Predefined elementary functions of highest accuracy for the arithmetic
+ data types
+ - Data type dotprecision for the exact representation of dot products
+ - Library of mathematical problem-solving routines with automatic result
+ verification and high accuracy
+
+WWW: http://www.math.uni-wuppertal.de/~xsc/