SET
A set is a well defined collection of objects, called the “elements” or “members” of the set.
A specific set can be defined in two ways-
If there are only a few elements, they can be listed individually, by writing them between curly braces ‘{ }’ and placing commas in between. E.g.- {1, 2, 3, 4, 5}
The second way of writing set is to use a property that defines elements of the set.
e.g.- {x | x is odd and 0 < x < 100}
If x is an element o set A, it can be written as ‘x A’
If x is not an element of A, it can be written as ‘x A’
Special types of sets-
Standard notations used to define some sets:
N- set of all natural numbers
Z- set of all integers
Q- set of all rational numbers
R- set of all real numbers
C- set of all complex numbers
TYPES OF SETS
-subset
-singleton set
-universal set
-empty set
-finite set
-infinte set
-eual set
-disjoint set
-cardinal set
-power set
OPERATIONS ON SET
The four basic operations are:
1. Union of Sets
2. Intersection of sets
3. Complement of the Set
4. Cartesian Product of sets
Union of two given sets is the smallest set which contains all the elements of both the sets.
A B = {x | x A or x B}
Let a and b are sets, the intersection of two sets A and B, denoted by A B is the set consisting of elements which are in A as well as in B
A B = {X | x A and x B}
If A B= , the sets are said to be disjoint.
If U is a universal set containing set A, then U-A is called complement of a set.
Students learn to define and identify linear equations. They also learn the definition of Standard Form of a linear equation.
Students also learn to graph linear equations using x and y intercepts.
SET
A set is a well defined collection of objects, called the “elements” or “members” of the set.
A specific set can be defined in two ways-
If there are only a few elements, they can be listed individually, by writing them between curly braces ‘{ }’ and placing commas in between. E.g.- {1, 2, 3, 4, 5}
The second way of writing set is to use a property that defines elements of the set.
e.g.- {x | x is odd and 0 < x < 100}
If x is an element o set A, it can be written as ‘x A’
If x is not an element of A, it can be written as ‘x A’
Special types of sets-
Standard notations used to define some sets:
N- set of all natural numbers
Z- set of all integers
Q- set of all rational numbers
R- set of all real numbers
C- set of all complex numbers
TYPES OF SETS
-subset
-singleton set
-universal set
-empty set
-finite set
-infinte set
-eual set
-disjoint set
-cardinal set
-power set
OPERATIONS ON SET
The four basic operations are:
1. Union of Sets
2. Intersection of sets
3. Complement of the Set
4. Cartesian Product of sets
Union of two given sets is the smallest set which contains all the elements of both the sets.
A B = {x | x A or x B}
Let a and b are sets, the intersection of two sets A and B, denoted by A B is the set consisting of elements which are in A as well as in B
A B = {X | x A and x B}
If A B= , the sets are said to be disjoint.
If U is a universal set containing set A, then U-A is called complement of a set.
Students learn to define and identify linear equations. They also learn the definition of Standard Form of a linear equation.
Students also learn to graph linear equations using x and y intercepts.
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Introduction to Sets and Set Operations. The presentation include contents of a KWLH Chart, Essential Questions, and Self-Assessment Questions. With exploration and formative assessments.
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If you are looking for math video tutorials (with voice recording), you may download it on our YouTube Channel. Don't forget to SUBSCRIBE for you to get updated on our upcoming videos.
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Introduction to Sets and Set Operations. The presentation include contents of a KWLH Chart, Essential Questions, and Self-Assessment Questions. With exploration and formative assessments.
Math 7 | Lesson 2 Set Operations and the Venn DiagramAriel Gilbuena
This lesson is about Set Operations and Venn Diagram. Examples, and assessments are included. For more presentation visit https://www.youtube.com/channel/UCltDbhOXh6r9FyYE52rWzCQ/playlists?shelf_id=18&view_as=subscriber&sort=dd&view=50
Factor Theorem and Remainder Theorem. Mathematics10 Project under Mrs. Marissa De Ocampo. Prepared by Danielle Diva, Ronalie Mejos, Rafael Vallejos and Mark Lenon Dacir of 10- Einstein. CNSTHS.
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Brian Covello: Research in Mathematical Group Representation Theory and SymmetryBrian Covello
Brian Covello's research review on group representation theory and symmetry. In the mathematical field of representation theory, group representations describe abstract groups in terms of linear transformations of vector spaces; in particular, they can be used to represent group elements as matrices so that the group operation can be represented by matrix multiplication. Representations of groups are important because they allow many group-theoretic problems to be reduced to problems in linear algebra, which is well understood. They are also important in physics because, for example, they describe how the symmetry group of a physical system affects the solutions of equations describing that system.
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It turns out that an equation x^p+y^q=z^w has a solution in Z+ if and only if at least one exponent p or q or w equals 2.DOI:10.13140/RG.2.2.15459.22567/7
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Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
1. Page 1 of 3
ISOMORPHISM
GROUP ISOMORPHISM
Let G and G’ be groups with operations ∗and ∗ ′. An isomorphism 𝜑 from a group G to a group G’ is a
one – to – one mapping (or function) from G onto G’ that preserves the group operation. That is,
𝜑 𝑎 ∗ 𝑏 = 𝜑 𝑎 ∗ ′𝜑(𝑏) for all a, b in G.
If there is an isomorphism from G onto G’, we say that G and G’ are isomorphic and write G≅ G’.
Steps involved in proving that a group G is isomorphic to group G’:
1. “Mapping.” Define a candidate for isomorphism; that is, define a function 𝜑 from G to G’.
2. “1 – 1.” Prove that 𝜑 is one – to – one: that is, assume 𝜑 𝑎 = 𝜑(𝑏) and prove that 𝑎 = 𝑏.
3. “Onto.” Prove that 𝜑 is onto; that is, from any element g’ in G’, find an element g in G such
that 𝜑 𝑔 = 𝑔′.
4. “O.P.” Prove that 𝜑 is operation – preserving; that is, show that 𝜑 𝑎 ∗ 𝑏 = 𝜑 𝑎 ∗ ′𝜑(𝑏) for
all a andb in G.
Note: We can relate Steps 2 and 4 to Kernel and Homomorphism, respectively.
HOMOMORPHISM
Let G and G’ be groups with operations ∗and ∗ ′. A homomorphism of G into G’ is a mapping 𝜑 of G
intoG’ such that for every a and b in G,
𝜑 𝑎 ∗ 𝑏 = 𝜑 𝑎 ∗′
𝜑 𝑏 .
Examples: Determine whether the given map is a homomorphism.
1. Let 𝜑: 𝑅∗
→ 𝑅∗
under addition given by 𝜑 𝑥 = 𝑥2
.
Answer: 𝜑 𝑥 + 𝑦 = 𝑥 + 𝑦 2
= 𝑥2
+ 2𝑥𝑦 + 𝑦2
≠ 𝑥2
+ 𝑦2
= 𝜑 𝑥 + 𝜑(𝑦). Thus 𝜑 is NOT a
homomorphism.
2. Let 𝜑: 𝑅∗
→ 𝑅∗
under multiplication given by 𝜑 𝑥 = 𝑥2
.
Answer: 𝜑 𝑥𝑦 = 𝑥𝑦 2
= 𝑥2
𝑦2
= 𝑥2
𝑦2
= 𝜑 𝑥 ∙ 𝜑(𝑦). Thus 𝜑 is a homomorphism.
3. Let 𝜑: 𝑅∗
→ 𝑅∗
under multiplication given by 𝜑 𝑥 = −𝑥.
Answer: 𝜑 𝑥𝑦 = − 𝑥𝑦 = −𝑥𝑦 ≠ −𝑥 (−𝑦) = 𝜑 𝑥 ∙ 𝜑(𝑦). Thus 𝜑 is NOT
ahomomorphism.
Types of Homomorphisms:
1. Epimorphism – surjective homomorphism
2. Monomorphism – injective homomorphism
3. Isomorphism – bijective homomorphism
4. Automorphism – isomorphism, domain and codomain are the same group
5. Endomorphism – homomorphism, domain and codomain are the same group
KERNEL
Let 𝜑: 𝐺 → 𝐺′ be a homomorphism of groups. The subgroup 𝜑−1
𝑒′
= 𝑥 𝜖 𝐺 𝜑 𝑥 = 𝑒′ is the
kernel of 𝜑, denoted by Ker(𝜑).
Examples: Find the kernel of the following homomorphism:
1. Let 𝜑: 𝑅∗
→ 𝑅∗
under multiplication given by 𝜑 𝑥 = 𝑥2
.
Answer: The identity element of the set of images is 1 under the operation of multiplication.
If 𝑥2
= 1 then 𝑥 = −1 or 𝑥 = 1. Thus, Ker(𝜑)={−1,1}.
2. Page 2 of 3
2. Let 𝜑: 𝑍 → 𝑍 under addition given by 𝜑 𝑥 = 5𝑥.
Answer: The identity element of the set of images is 0 under the operation of addition. If 5x
= 0, then x = 0. Thus, Ker(𝜑)={0}.
COROLLARY:
A group homomorphism 𝜑: 𝐺 → 𝐺′ is one – to – one map if and only if Ker(𝜑) = {𝑒}.
In view of this corollary, we can modify our steps in showing that two groups are isomorphic.
To show 𝝋: 𝑮 → 𝑮′ is an isomorphism: (modified version)
1. Show 𝜑 is a homomorphism.
2. Show Ker(𝜑) = {𝑒}.
3. Show 𝜑 maps G onto G’.
Examples: (On showing isomorphism between G and G’)
A. Let us show that the binary structure <R, +> with operation the usual addition is isomorphic to
the structure <R+, ∙> where ∙ is the usual multiplication.
Step 1. We have to somehow convert an operation of addition to multiplication. Recall from
𝑎 𝑏+𝑐
= 𝑎 𝑏
(𝑎 𝑐
) that the addition of exponents corresponds to multiplication of two quantities.
Thus we try defining 𝜑: 𝑅 → 𝑅+
by 𝜑 𝑥 = 𝑒 𝑥
for 𝑥 ∈ 𝑅. Note that 𝑒 𝑥
> 0 for all 𝑥 ∈ 𝑅 so indeed
𝜑 𝑥 ∈ 𝑅+
.
Step 2. If 𝜑 𝑥 = 𝜑(𝑦), then 𝑒 𝑥
= 𝑒 𝑦
. Taking the natural logarithm, we see that 𝑥 = 𝑦, so 𝜑 is
indeed 1-1.
Step 3. If 𝑟 ∈ 𝑅+
, then ln(𝑟) ∈ 𝑅 and 𝜑 ln 𝑟 = 𝑒ln 𝑟
= 𝑟. Thus 𝜑 is onto R+.
Step 4.For𝑥, 𝑦 ∈ 𝑅, we have𝜑 𝑥 + 𝑦 = 𝑒 𝑥+𝑦
= 𝑒 𝑥
∙ 𝑒 𝑦
= 𝜑 𝑥 ∙ 𝜑 𝑦 .
Thus, 𝜑 is an isomorphism.
B. Let 2𝑍 = 2𝑛 𝑛 ∈ 𝑍 , so that 2Z is the set of all even integers, positive, negative and zero. We
claim that <Z, +> is isomorphic to <2Z, +> where + is the usual addition.
Step 1. Define 𝜑: 𝑍 → 2𝑍 by 𝜑 𝑛 = 2𝑛 for 𝑛 ∈ 𝑍.
Step 2. If 𝜑 𝑚 = 𝜑(𝑛), then 2𝑚 = 2𝑛 so 𝑚 = 𝑛. Thus 𝜑 is 1-1.
Step 3. If 𝑛 ∈ 2𝑍, then n is even so 𝑛 = 2𝑚 for 𝑚 = 𝑛/2 ∈ 𝑍. Hence 𝜑 𝑚 = 2(𝑛/2) = 𝑛 so 𝜑 is onto
2Z.
Step 4. For𝑚, 𝑛 ∈ 𝑍, we have𝜑 𝑚 + 𝑛 = 2 𝑚 + 𝑛 = 2𝑚 + 2𝑛 = 𝜑 𝑚 + 𝜑(𝑛).
Thus, 𝜑 is an isomorphism.
C. Determine whether the given map 𝜑 is an isomorphism of the first binary structure with the
second.
1. <Z, +> with <Z, +> where 𝜑 𝑛 = 2𝑛 for 𝑛 ∈ 𝑍.
Answer: 𝜑 is 1-1, but NOT onto. Thus, 𝜑 is NOT an isomorphism.
2. <Z, +> with <Z, +> where 𝜑 𝑛 = 𝑛 + 1 for 𝑛 ∈ 𝑍.
Answer:𝜑 is 1-1, onto, but NOT operation preserving. Thus, 𝜑 is NOT an isomorphism.
3. Page 3 of 3
3. <R, ∙> with <R, ∙> where 𝜑 𝑥 = 𝑥3
for 𝑥 ∈ 𝑅.
Answer:𝜑 is 1-1, onto, and operation preserving. Thus, 𝜑 is an isomorphism.
4. <R, +> with <R+, ∙> where 𝜑 𝑟 = 0.5 𝑟
for 𝑟 ∈ 𝑅.
Answer:𝜑 is 1-1, onto, and operation preserving. Thus, 𝜑 is an isomorphism.
CAYLEY’S THEOREM
Every group is isomorphic to a group of permutations.
Example:
Let 𝐺 = {2,4,6,8}⊆Z10, where G forms a group with respect to multiplication modulo 10. Write out
the elements of a group of permutations that are isomorphic to G, and exhibit an isomorphism from
G to this group.
Solution:
Let 𝜑 𝑎 : 𝐺 → 𝐺′ be defined by 𝜑 𝑎 𝑥 = 𝑎𝑥 for each 𝑥 ∈ G. Then we have the following permutations:
𝜑2 =
𝜑2 2 = 4
𝜑2 4 = 8
𝜑2 6 = 2
𝜑2 8 = 6
𝜑4 =
𝜑4 2 = 8
𝜑4 4 = 6
𝜑4 6 = 4
𝜑4 8 = 2
𝜑6 =
𝜑6 2 = 2
𝜑6 4 = 4
𝜑6 6 = 6
𝜑6 8 = 8
𝜑8 =
𝜑8 2 = 6
𝜑8 4 = 2
𝜑8 6 = 8
𝜑8 8 = 4
Thus, the set 𝐺′
= {𝜑2, 𝜑4, 𝜑6, 𝜑8} is a group of permutations and the mapping 𝜑: 𝐺 → 𝐺′ is defined
by
𝜑:
𝜑 2 = 𝜑2
𝜑 4 = 𝜑4
𝜑 6 = 𝜑6
𝜑 8 = 𝜑8
is an isomorphism from G to G’.
CAYLEY TABLE
A Cayley table (or operation table) of a (finite) group is a table with rows and columns labelled by
the elements of the group and the entry 𝑔 ∗ ℎ in the row labelled g and column labelled h.
CAYLEY DIGRAPHS (DIRECTED GRAPHS)/CAYLEY DIAGRAMS
For each generating set S of a finite group G, there is a directed graph representing the
group in terms of the generators of S.
A digraph consists of a finite number of points, called vertices of the digraph, and some arcs
(each with a direction denoted by an arrowhead) joining vertices.
In a digraph for a group G using the generator set S we have one vertex, represented by a
dot, for each element of G.
Each generator in S is denoted by one type of arc.
Example:
At the right is a possible digraph for𝑍6 with𝑆 = {2, 3} using for
<2> and --- for <3>.
4. Page 4 of 3
University of Santo Tomas
College of Education
España, Manila
MATH 115: Abstract Algebra
Performance Task 1: Oral Presentation
Written Report on
Isomorphism
Submitted by:
CAPIOSO, RIKKI JOI A.
CHUA, ERNESTO ERIC III A.
GONZALES, MA. IRENE G.
PARK, MIN YOUNG
4MM
Submitted to:
Assoc. Prof. JOEL L. ADAMOS
Course Facilitator
Date Submitted:
08 April 2015, Wednesday