Proof of the Fundamental Homomorphism Theorem in Abstract Algebra
A detailed explanation and proof of the Fundamental Homomorphism Theorem within the context of Abstract Algebra. Support the course by joining Wrath of Math for full access to videos and lecture notes.

Wrath of Math
6.7K views • Jul 11, 2023

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We introduce and prove the fundamental homomorphism theorem (also called the first isomorphism theorem), which states that every homomorphic image of a group G is isomorphic to the quotient group of G by the kernel of f, given that f is a homomorphism from G onto H. To prove this we will use some prior results. We previously proved that a quotient group of G is a homomorphic image of G, so we now have that a group is a quotient group of G if and only if it is a homomorphic image of G (or isomorphic to one). So homomorphic images and quotient groups are somewhat interchangeable. #abstractalgebra #grouptheory
Proof f(a)=f(b) iff Ka=Kb: https://youtu.be/BlCU-Kr78qs
Normal Subgroups: https://youtu.be/kbT5SyF3H60
Coset Multiplication on Normal Subgroups: https://youtu.be/DJyOdMBUdnM
Kernels of Homomorphisms: https://youtu.be/j8SQDZ96LVs
Quotient Groups and Homomorphic Images: https://youtu.be/MKDAZV0XasI
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Abstract Algebra course: https://www.youtube.com/playlist?list=PLztBpqftvzxVvdVmBMSM4PVeOsE5w1NnN
Abstract Algebra exercises: https://www.youtube.com/playlist?list=PLztBpqftvzxVQNtNnXeHB_1yquKUY98Xz
Get the textbook! https://amzn.to/45IvVgH
Business Inquiries: wrathofmathlessons@gmail.com
We introduce and prove the fundamental homomorphism theorem (also called the first isomorphism theorem), which states that every homomorphic image of a group G is isomorphic to the quotient group of G by the kernel of f, given that f is a homomorphism from G onto H. To prove this we will use some prior results. We previously proved that a quotient group of G is a homomorphic image of G, so we now have that a group is a quotient group of G if and only if it is a homomorphic image of G (or isomorphic to one). So homomorphic images and quotient groups are somewhat interchangeable. #abstractalgebra #grouptheory
Proof f(a)=f(b) iff Ka=Kb: https://youtu.be/BlCU-Kr78qs
Normal Subgroups: https://youtu.be/kbT5SyF3H60
Coset Multiplication on Normal Subgroups: https://youtu.be/DJyOdMBUdnM
Kernels of Homomorphisms: https://youtu.be/j8SQDZ96LVs
Quotient Groups and Homomorphic Images: https://youtu.be/MKDAZV0XasI
★DONATE★
◆ Support Wrath of Math on Patreon for early access to new videos and other exclusive benefits: https://www.patreon.com/join/wrathofmathlessons
◆ Donate on PayPal: https://www.paypal.me/wrathofmath
Follow Wrath of Math on...
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Video Information
Views
6.7K
Likes
123
Duration
8:00
Published
Jul 11, 2023
User Reviews
4.6
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