Study Notes on Closure properties of Languages
By BYJU'S Exam Prep
Updated on: September 25th, 2023

Closure properties on regular languages are defined as certain operations on regular language which are guaranteed to produce regular language. Closure refers to some operation on a language, resulting in a new language that is of the same “type” as originally operated on i.e., regular.
Table of content
The table below shows the closure properties of all the formal languages.
Note :Union , Intersection or difference with regular doesn’t change the language. i.e.
Let (AnyLANG) below represents any of the language among DCFl , CFl , CSL , RE or REC
Regular ∩ AnyLANG = AnyLANG
Regular ∪ AnyLANG = AnyLANG
Regular – AnyLANG = AnyLANG
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