impossible event

(probability theory) An event that contains no possible outcomes and thus cannot possibly occur; an empty set.

Japanese Meaning

（確率論で）起こりうる結果が全く存在しない、発生不可能な事象。 / 空集合を表す、つまり実現し得ない事象。

In probability theory, an impossible event contains no possible outcomes and therefore cannot occur.

確率論では、可能な結果を一切含まない事象は発生し得ないため、その確率はゼロです。

Sense（1）

(probability theory) An event that contains no possible outcomes and thus cannot possibly occur; an empty set.

impossible events

（ plural ）