infinity

無限大

数えて到達できるどんな数よりも大きいという数学上の考え。

やさしい英語で： The mathematical idea of a quantity larger than any number you can count to.

• You cannot count to infinity.
• The symbol for infinity looks like a sideways eight.
• As the value approaches infinity, the curve becomes flatter.

類義語： mul:∞

よく使う表現： approach infinity, positive infinity, negative infinity

無限、無限性

時間や空間、大きさに終わりや限界がないこと。

やさしい英語で： The state of having no end or limit in time, space, or size.

• The road seemed to stretch into infinity.
• She wondered about the infinity of space.
• Looking at the stars gave him a sense of infinity.

類義語： endlessness, limitlessness

よく使う表現： stretch into infinity, the infinity beyond, infinity of space

無限大

計算で他の値に比べて非常に大きく、無限として扱われる値。

やさしい英語で： A value so large compared with other values in a calculation that it is treated as having no limit.

• In this model, that distance is effectively infinity.
• We treated the large resistance as infinity to simplify the calculation.
• For this approximation, the much larger value counts as infinity.

よく使う表現： effectively infinity, take as infinity, approximate by infinity