real sign function (Q105356166)
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function which assigns a number (-1,0,1) to a real number according to its sign
- real signum
- signum
- sign function
- sgn
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | real sign function |
function which assigns a number (-1,0,1) to a real number according to its sign |
|
Statements
![{\displaystyle \operatorname {sgn} a=[a>0]-[a<0]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/9fea7cb472002fc38c0d877bc7712268f9534840)
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![{\displaystyle [\cdot ]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/41b4e841c71afe1890198191aab15bc225bbc0b6)
signum a
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