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出典:Wiktionary
bottom type (複数形 bottom types)
Null
Nothing
出典:Wikipedia
出典:『Wikipedia』 (2011/01/25 20:16 UTC 版)
In type theory, a theory within mathematical logic, the bottom type is the type that has no values. It is also called the zero or empty type, and is sometimes denoted with falsum (⊥).
bottom type