The radix of the set is the tool which research the real-valued function.
集合的基数是深刻研究实函数的工具。
An R-function is a real-valued function whose sign is completely determined by the signs of its arguments.
函数是一系列实函数，其函数值的符号完全取决于其各个变量的符号。
An R-function is a real-valued function whose sign is completely determined by the signs of its arguments.
函数是一系列实函数，其函数值的符号完全取决于其各个变量的符号。
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