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・ Signal Hill (New Zealand)
・ Signal Hill (Prince William County, Virginia)
・ Signal Hill Battery
・ Signal Hill Battery, Gibraltar
・ Signal Hill Elementary School
・ Signal Hill Transmission
・ Signal Hill, Calgary
・ Signal Hill, California
・ Signal Hill, St. John's
・ Signal Hill-Quidi Vidi
・ Signal Iduna
・ Signal instrument
・ Signal integrity
・ Sign extension
・ Sign Formation
Sign function
・ Sign Here, Here and Here
・ Sign Hill Park
・ Sign In Please
・ Sign in the Sky
・ Sign language
・ Sign Language Centre Belfast
・ Sign language glove
・ Sign language in Singapore
・ Sign language in the brain
・ Sign Language Interpreters Association of New Zealand
・ Sign Language Studies
・ Sign name
・ Sign o' the Times
・ Sign o' the Times (film)


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Sign function : ウィキペディア英語版
Sign function

In mathematics, the sign function or signum function (from ''signum'', Latin for "sign") is an odd mathematical function that extracts the sign of a real number. In mathematical expressions the sign function is often represented as sgn.
==Definition==
The signum function of a real number ''x'' is defined as follows:
: \sgn(x) := \begin
-1 & \text x < 0, \\
0 & \text x = 0, \\
1 & \text x > 0. \end

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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