古典数学家相信这个数字代表了最美观的矩形的尺寸，不过它一般出现在计算数学中。
Classical mathematicians believed that this number represented the most aesthetically pleasing ratio for the dimensions of a rectangle, but it also turns up in computational mathematics.
这里构建的 DSL 是一个简单的计算器语言，用于获取并计算数学表达式。
The DSL being built here is a simple calculator language, designed to take mathematical expressions and evaluate them.
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