Math Symbols
The Most Valuable and Important
Symbols For Set Notation In Use:
"NOT Subset (left) of Set (right)"
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 "NOT Subset (left) of Set (right)" -
D  A means Set "D" IS NOT a Subset of Set "A":
Example 1:
, Set A: A = {a, b, c, d}
Set D: D = {x, z}
. . .
Both Set "D" and Set "A" contain completely different elements. They have nothing in common.
Set D is "NOT a Subset" of Set A
D A
Example 2:
, Set B: B = {1, 3, 9, 11}
Set E: E = {9, 55}
. . .
Both Set "E" and Set "B" do contain one common element: 9. However, in order for Set "E" to be a subset of Set "B", all of the elements in Set "E" must also be present in Set "B". The number 55 is present in Set "E", but is missing in Set "B".
Set E is "NOT a Subset" of Set B
E B
Example 3:
, Set C: C = {dog, cat, bird,
horse, rabbit}
Set F: F = {hawk, fish}
. . .
Both Set "F" and Set "C" contain completely different elements. They have nothing in common.
Set F is "NOT a Subset" of Set C
F C
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