这意味着以函数式语言编写多线程应用程序要容易得多，因为不可变数据结构与线程交互起来非常自然，因而代码可以很简洁。
This means that it is much easier to write multi-threading applications in functional languages because immutable data structures inherently interact cleanly with threads.
此部分课程扩展了统计学中的基本数学概念。三个基本想法如下：随机变数，密度函数与期望。
This section of the course develops the mathematical concepts used in statistics. Three ideas are essential: Random Variable, Density Functions, and Expectations.
查看所有的函数，变数和其它内容，可以在页面的更新版本中更改这些内容，而且确定这些内容还没有更改。
Check all functions, variables, and other things that could change in newer versions in the page, and make sure they didn't.
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