对于浮点算法而言，许多惯用的实数算法代数规则有时并不适用。

Many of the familiar algebraic rules for real number arithmetic do not always hold for floating-point arithmetic.

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答案要看 simplex 算法背后采用的代数关系，但是有关它是如何工作的解释已经超出了本文的范围。

The answer is in the algebra behind the simplex algorithm, but explaining how it works is beyond the scope of this article.

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数学家对此很熟悉；如果将代数中的常见问题考虑成复数而不是实数时，那么这些问题就更容易处理，尽管复数算法较难。

Mathematicians are familiar with this; common problems in algebra are more tractable when considered over the complex numbers than over the reals, even though complex arithmetic is more difficult.

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