Question Number 198380 by pascal889 last updated on 18/Oct/23
Commented by Rasheed.Sindhi last updated on 18/Oct/23
$$\mathbb{U}=? \\ $$$${Universal}\:{set}\:{is}\:{not}\:{given} \\ $$
Commented by AST last updated on 18/Oct/23
$${That}\:{is}\:{always}\:{true}:\:\left({AnB}\right)'={A}'{uB}' \\ $$
Commented by Rasheed.Sindhi last updated on 19/Oct/23
$$\mathcal{T}{rue},\:{but}\:{the}\:{identity}\:\:{has}\:{been}\:{required} \\ $$$$\:{to}\:{show}\:{by}\:{the}\:{example}\:{which}\:{lacks} \\ $$$$\:{Universal}\:{set}. \\ $$