This lecture gives an elementary introduction to a book with the above title, written jointly with Mutsumi Saito and Nobuki Takayama and to appear shortly in the Springer Series Algorithms and Computation in Mathematics. The current manuscript including a long list of references can be found by surfing my home page http://math. berkeley. edu/~bernd/.
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机译：本讲座向上述标题进行了基本的介绍，与Mutsumi Saito和Nobuki Takayama联合书写，并在Springer系列算法和数学计算中出现。通过冲浪我的主页HTTP：// MATH，可以找到包括长篇参考文献列表的当前稿件。伯克利。 edu /〜bernd /。
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