Question

In set-builder method the null set is represented by
A. \{\}
B. \(\Phi\)
C. \(\{x: x \neq x\}\)
D. \(\{x: x=x\}\)

Answer 1

We know \(x \neq x\) is false for any \(x\).
\(\therefore\) the set builder form for null set is \(\{x: x \neq x\}\).