Math Symbols
The Most Valuable and Important
Symbols For Set Notation In Use:
"Intersection of Sets"
Background - why math symbols are used. . .
Symbols are a concise way of giving lengthy instructions related to
numbers and logic.
Symbols are an invention, not a discovery. They are a
communication tool. Symbols are used to eliminate
the need to write long, plain language instructions to describe
calculations and other processes.
The most valuable, most frequently used Math Symbols . . .
The most important, most frequently used Symbols for Set Notation
are listed below.
Symbols for Set Notation - click symbol
Math Symbol for the "Intersection of Sets" -
D  A equals a new set which includes only those common elements which appear in both Set "D" AND Set "A". This is similar to the intersection of two streets. The area of overlap, where the two streets cross one another, is the intersection.
Example 1:
, Set A: A = {a, b, c, d}
Set D: D = {e, f}
. . .
The Intersection of Set "D" and Set "A" produces an EMPTY SET (a NULL Set). Set "A" and Set "D" have no elements in common with one another.
D A = {}
D A =
Note: Set "A" and Set "D" are called Disjoint Sets because they have no common elements.
Example 2:
, Set B: B = {1, 3, 9, 11, 13, 14}
Set E: E = {1, 3, 9, 11}
. . .
Both Set "E" and Set "B" contain some of the same elements: 1, 3, 9, 11. These common elements are the intersection of the two Sets.
E B = {1, 3, 9, 11}
Example 3:
, Set C: C = {dog, horse, bird,
rabbit, cat}
Set F: F = {cat, rabbit}
. . .
Both Set "F" and Set "C" list the following elements in a different order: rabbit, cat
F C = {rabbit, cat}
Note: the elements within a SET can be listed in any order.
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