Question Number 31237 by pieroo last updated on 04/Mar/18
$$\mathrm{Show}\:\mathrm{that}\:\mathrm{A}−\mathrm{B}\:=\:\mathrm{B}'\:\cap\:\mathrm{A}. \\ $$
Commented by Tinkutara last updated on 04/Mar/18
You can also see on internet https://www.wyzant.com/resources/answers/272263/prove_a_b_a_intersection_b
Commented by pieroo last updated on 04/Mar/18
$$\mathrm{where}\:\mathrm{can}\:\mathrm{i}\:\mathrm{get}\:\mathrm{it}\:\mathrm{please}? \\ $$
Commented by pieroo last updated on 04/Mar/18
$$\mathrm{thanks}\:\mathrm{sir} \\ $$