Explain {{0}}. What do the double curly brackets mean ?

0 is not a double curley but it is a set in which element is 0.It is similar like 1, here is element of the set so in 0, 0 is the element of the set.

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State whether the following questions are true and false ?
1. 0 ​​E {{0}}
2. {0} E {0,{0}}
3. {0} E {0}
4. 0 E { {0,{0}}}
5. 0 E {0, {0}}
Please explain use of double curly brackets in some of these questions 











 
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