grammaticality - Omitting subject or be verb in the second clause



Which one is the most natural?



  1. Such set is called an empty set and it is denoted by 0.

  2. Such set is called an empty set and is denoted by 0.

  3. Such set is called an empty set and denoted by 0.



Answer



While the rest of them quibble, I will summarize: #2 is best, but you need to insert "a" — "Such a set". Clear?


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