Kenneth Rosen Edition 7 Exercise 2.1 Question 10 (Page No. 125)

Question

Determine whether each of these statements is true or false.

1. $\phi$ $ \epsilon$ {$\phi$}
2. $\phi$ $\epsilon$ {$\phi,$ { $\phi$}}
3. {$\phi$} $ \epsilon$ {$ \phi$}
4. {$\phi$} $\epsilon $ {{$\phi$}}
5. {$\phi$} $\subset$ {$0$}
6. {$0$} $\subset$ {$\phi$ , { $\phi$ }}
7. {$\phi$} $\subset$ {{$\phi$ }, { $\phi$}}

Answer 1

a,b,d are true.