And also in the following expression

And if i had to exhibit an element for the following set. We get {{2}, 1, {1,2}}Code:{ s : PN; a : N; t : PN | a <ele> s ^ a <ele> t }

Now the question is, the first element is {2} which is from s which is of type Power set of Natural numbers. But 'a' is not an element of s. As a {2} not equal to 2. Am i right?

And also I’m not sure how the 1 got from a as well. So it seems like there two expression in the set comprehension which apples to s & t but not for a?

Please help me understand.

Thanks

Harish