Tue April 20, 2010 By: Sidharth Acharya

Let A={1,2{3,4},5}.Then {phi} is not a subset of A.Why?

Expert Reply
Tue April 20, 2010

phi the empty set is a subset of every set, true.

 but what you have written is {phi}

this is a set by itself and clearly not a subset of A.

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