Mathematica 9 is now available
Technology Guide--The Technology Inside Matters
Piecewise Functions

With system-wide support, Mathematica automatically correctly handles arbitrary-dimension, arbitrarily nested piecewise functions--functionality with different definitions in different regions.

Piecewise functionality is of wide-ranging importance across a number of different fields, including many areas of engineering (particularly hybrid systems) and education.

The need to handle piecewise functions is common in many real-life models.



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