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I have been reading the PHP manual in both Japanese and English and have reached the part about operators. In the 代数演算子 section they talk about 加算, 減算 etc, and have a table showing all of the 代数演算子 (you can see it here: http://www.php.net/manual/ja/language.operators.arithmetic.php)

In the Japanese version of the manual they describe -$a as 負にする but in the English version they use the word Negation.

I wondered if there was a noun in Japanese to describe this, like there is 加算 to describe Addition.

Since they use the word Negation in the English version I thought maybe 否定 in Japanese, but I'm not sure, so if any one knows of a noun to describe this concept any help would be appreciated.

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Just FYI, codecademy has some basic courses in Japanese that might be useful for seeing basic concepts explained as they would be to a native speaker. – ssb Mar 7 '13 at 6:32
@ssb Thank you for letting me know, I'll have to take a look at them. – Jake Lucas Mar 7 '13 at 7:26
up vote 4 down vote accepted

Find here http://ejje.weblio.jp/content/negation

4)〔数学〕否定, 相反《真偽を逆にした命題》.

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Thank you for linking me to this definition. Just for everyone else's information, I found that the word for the - operator in Japanese when used as -$a is 単項マイナス演算子 (Unary Minus Operator). – Jake Lucas Mar 7 '13 at 7:25

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