Question -
Answer -
(i) B тКВ A тИк B
Let us consider an element тАШpтАЩ such that it belongs to B
тИ┤ p тИИ B
p тИИ B тИк A
B тКВ A тИк B
(ii) A тИй B тКВ A
Let us consider an element тАШpтАЩ such that it belongs to B
тИ┤ p тИИ A тИй B
p тИИ A and p тИИ B
A тИй B тКВ A
(iii) A тКВ B тЗТ A тИй B = A
Let us consider an element тАШpтАЩ such that it belongs to A тКВ B.
p тИИ A тКВ B
Then, x тИИ B
Let and p тИИ A тИй B
x тИИ A and x тИИ B
x тИИ A and x тИИ A (since, A тКВ B)
тИ┤ (A тИй B) = A