Inverse element
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Let a be an element of the set G. For the operation, i.e. associative +, there is exactly one x such that a・x = x・a = e . This x is called the inverse of a , and is written as a -1 . When associative + is used, the inverse is written as -a (→ group). Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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集合 G の元を a とする。演算，すなわち結合法・について，a・x＝x・a＝e を満たす x は，ただ1つ定まる。この x を a の逆元といい，a-1 と書く。結合法が＋で表わされるときは，その逆元を －a と書く (→群 ) 。
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