Question Number 109329 by mohammad17 last updated on 22/Aug/20
$${if}\:{all}\:{A},{B}\:{be}\:{a}\:{set}\:{prove}\:{that}\left(\:{A}^{{B}} =\:\emptyset\leftrightarrow{A}=\emptyset\:{and}\:{B}=\emptyset\right)\: \\ $$$${help}\:{me}\:{sir}\: \\ $$
Commented by kaivan.ahmadi last updated on 22/Aug/20
$${hi}\:{sir}.\:{what}\:{is}\:{the}\:{meaning}\:{of}\:{A}^{{B}} ? \\ $$