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7/31/2019 101 - Set Concepts and Naming Sets
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Basic Terms and Concept
Naming Sets
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A set is a well-defined
collection of objects which
are called elements ormembers. A well
defined set is a set whoseelements can clearly bedetermined.
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WELL DEFINED SET:
The set of members of one
direction
NOT WELL DEFINED:SET OF BEST BAND
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WELL DEFINED SET:
The set of months in a year
NOT WELL DEFINED:
The hottest months of theyear
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Sets are named using
capital letters.
Ellipsis () are used only ifthere is a clear pattern of
elements in a set and thatsome of these elements are
not shown or written.
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O = { 1, 3, 5, 7, 9}
E = {2, 4, 6, 8, 10, 20}W = {1, 2, 3, 4, 5, 6, }
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The elements of a set are
the distinct members
included in the discussion.
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A = {1, 4, 9, 16, 25 }
B = {1, 2, 3, 5, 8, 13, 21}
A4 A2
B21 B14
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The cardinality of a setrefers to the number of
elements in a set.
)(An
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A = {1, 4, 9, 16, 25 }
B = {1, 2, 3, 5, 8, 13, 21}7)( Bn
What is n(A)?
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Universal set refers to theset which contains all the
elements under discussion.
U
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U = {all counting numbers}
U = {all odd numbers}U = {all even numbers}
U = {all positive integers}
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Subsets are sets that areformed from some or all
elements of a given set.
BA AB
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ABU
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U = {all odd numbers}
C = {1, 3, 5}
D = {99, 101, 103}
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C = {1, 3, 5}
What are the subset of set C?How many subsets did you
form?
Is it possible to determine thenumber of subsets whose
cardinality is infinite?
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C = {1, 3, 5}
Is it possible to make a subsetthat contains all the elements
of the original set?
Is it possible to make a subsetthat has no elements?
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n
2n is the number of elements in
the given set
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E = {January, February, March,
.December}
Is it a well defined set?
Can you give two elements of set E?
What is the n (E)?Can you give one subset of set E?
How do you describe set E?
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enumerating the elements
of a set inside a pair ofbraces.
Example:Y= {January, February,MarchDecember}
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describing the common
property of the elements in aset without enumerating the
elements.Example:Y is the set of months in a year.
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Often used in higher
mathematics courses and is
easier to understand and moreconvenient to use since it is
concise.Example:Y = { x | x is a month in a year}
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[Journal]:
Write 3 important points that
you learned about todaystopic.