Answers

2014-07-11T18:40:31+05:30
There are many ways to describe a natural singleton set...

Such as there will be only one winner in the 2014 world cup :
{ x : x is the winner of the 2014 world cup }

And there are much more to describe

The highest mountain is the Mt. Everest :
{ x : x is the highest mountain in the world } :
{ EVEREST } 

, etc and thanks me again
0
2014-07-12T10:12:37+05:30
i can not understand this question
0