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New in Version 4.2
Mathematica 4.2 features new functionality and enhanced connectivity to Java, XML and the web. It also offers new and updated features for linear programming, statistics, optimization, combinatorics and authoring technical documents.
Numerical Computation
 Completely new implementation of the LinearProgramming solver.
Improved NSolve robustness and speed.
Faster packed array support for Dot and Transpose in higher dimensions.
Faster FactorInteger.
Algebraic Computation
Simplify now handles ProductLog and is stronger for Mod, Floor, Ceiling, Log, Erf, InverseErf, Erfc, and InverseErfc.
New operators NotElement and InvisibleTimes.
Notebook Interface
Slide show environment for presentations.
Theme support and full support for internationalization is provided with Windows XP and Windows 2000.
New characters for double struck, script, and Gothic numbers, the planets, and musical notes.
System Interface
Transparent Java integration with J/Link 2.0 and built-in Java Runtime Environment.
New import and export formats FITS and SDTS.
EPS import into notebooks.
Add-ons
NMinimize and NMaximize implement several algorithms for finding global constrained optima of a nonlinear objective function.
Comprehensive support for importing, manipulating, and exporting XML.
New XML formats for saving Mathematica notebooks and expressions.
Support for XHTML export, including style sheets.
Extended MathML 2.0 support.
Statistics enhancements, including new ANOVA package.
New bundled Combinatorica package for combinatorics and graph theory.
New bundled AuthorTools package for technical publishing.
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