De Morgan's Laws (Set Theory)/Set Difference/Difference with Union/Venn Diagram

Proof
Demonstration by Venn diagram:
 * DeMorgan-Minus-Union.png

The area in orange and red is the set difference of $S$ with $T_1$

The area in orange and yellow is set difference of $S$ with $T_2$

The area in orange only is the set difference of $S$ with the union of $T_1$ and $T_2$.

It is also seen to be the intersection of the set difference of $S$ with $T_1$ and the set difference of $S$ with $T_2$.