Open interval

Japanese: 開区間 - かいくかん(英語表記)open interval
Open interval
An interval is a range on a number line or real axis. If two real numbers are a and b ( a < b ), then the set of real numbers x that satisfy the inequality a < x < b is called an open interval with a and b as its endpoints. In other words, it is an interval that does not include either of the endpoints ( a and b are called its endpoints). This is written as ( a , b ) or ] a , b [.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
数直線あるいは実軸上の範囲の一つをいう (→区間 ) 。2つの実数を ab ( ab ) とするとき,不等式 axb を満足する実数 x の集合を,ab を両端とする開区間という。すなわち両端 ( ab をその端点という) を含まない区間のことである。これを ( ab ) または ]ab[ と書く。

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