Explain that relational algebra operators?

Question

Here is my DBMS question. Please answer in detail. 

Explain the statement that relational algebra operators can be composed. Why the ability to compose operators is important?

Answer

Relational algebra , an offshoot of first-order logic (and of algebra of sets), deals with a set of finitary relations (see also relation (database)) which is closed under certain operators.

Explain that relational algebra operators?

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