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- 为什么要定义符号函数 sgn x？ - 知乎
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- sgn函数 - 知乎
sgn函数 阶跃函数，数学上的符号函数或者计算机语言中的返回函数。 Sgn 函数 返回一个 Variant (Integer)，指出参数的正负号。
- How does one compute the sign of a permutation?
$$\textrm{sgn}(\sigma) = (-1)^{\sum_{0 \le i<j<n} (\sigma_i>\sigma_j)}$$ I e , the sign is negative iff there are an odd number of misordered pairs of indices This algorithm also works if we're interested in the permutation defined by an unsorted list of integers where the cycle structure can't be determined in linear time
- linear algebra - Prove that $sgn (\sigma_1 \circ \sigma_2) = sgn . . .
Now that you have established this well definedness property of sgn the problem becomes much easier You can consider the 4 possible cases when l and k are even and odd respectively You can consider the 4 possible cases when l and k are even and odd respectively
- sgnx函数在高等数学上都有什么用法？ - 知乎
我个人还是觉得sgn函数还是起到一种格式的作用，就像示性函数一样，做分类吧，在积分这类注重格式性的问题中，比较有用吧。 编辑于 2020-05-08 22:50 赞同 21 3 条评论
- How is the square of $\\operatorname{sgn}(x)$ defined?
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