Venn diagrams use circles to enclose members of sets. If sets contain the same
element(s) the circles overlap or intersect. If sets do not contain the same
elements, there is no intersection or overlap.
For example, if H = {0, 3, 6, 9} and J = {0, 6, 12}, then
the union of H and J is {0, 3, 6, 9, 12} and is indicated by the shaded region
below.
H J
For example, if H = {0, 3, 6, 9} and J = {0, 6, 12}, then
the intersection of H and J is {0, 6} and is indicated by the shaded region
below.
H J
Suppose we have sets C = {6, 7, 8} and D = {9, 10, 11, 12}. The
union of these sets are shown in Figure A while the intersection is shown in
Figure B.
C D
C D
