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English
real sign function
function which assigns a number (-1,0,1) to a real number according to its sign
real signum
signum
sign function
sgn
In more languages
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Statements
instance of
integer-valued function
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sign function
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function of a real variable
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step function
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odd function
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image
Signum function.png
248 × 199; 4 KB
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defining formula
sgn
a
=
{
1
a
>
0
0
a
=
0
−
1
a
<
0
{\displaystyle \operatorname {sgn} a={\begin{cases}1&a>0\\0&a=0\\-1&a<0\end{cases}}}
1 reference
stated in
ISO 80000-2:2019 Quantities and units — Part 2: Mathematics
section, verse, paragraph, or clause
2-10.13
sgn
a
=
[
a
>
0
]
−
[
a
<
0
]
{\displaystyle \operatorname {sgn} a=[a>0]-[a<0]}
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in defining formula
a
{\displaystyle a}
symbol represents
real number
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{
{\displaystyle \{}
symbol represents
piecewise function
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sgn
a
{\displaystyle \operatorname {sgn} a}
symbol represents
sign function
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[
⋅
]
{\displaystyle [\cdot ]}
symbol represents
Iverson bracket
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definition domain
set of real numbers
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image of function
set of 0 and ±1
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described by source
ISO 80000-2:2019 Quantities and units — Part 2: Mathematics
section, verse, paragraph, or clause
2-10.13
subject named as
signum a
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maintained by WikiProject
WikiProject Mathematics
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different from
complex sign function
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sine
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parity of a permutation
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Heaviside function
criterion used
affine transformation
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Identifiers
IEV number
103-03-04
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MathWorld ID
Sign
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imported from Wikimedia project
Hebrew Wikipedia
nLab ID
sign function
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