# Group Theory Flashcards, test questions and answers

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## What is Group Theory?

Group Theory is a branch of mathematics that studies the structure, actions, and properties of mathematical groups. It is one of the most important areas of modern mathematics, with applications to many branches such as algebra, number theory, geometry, physics, chemistry and computer science. Group Theory has also found importance in philosophy and sociology.In Group Theory a group is defined as a set with an operation defined on it that obeys certain rules; this operation may be addition or multiplication (or some other operation). The elements within the group are related to each other by this operation; for example if G = {a, b} and the operation is + then a + b = b + a. Groups are used because they offer ways to study symmetries in structures; in particular they provide powerful tools to study symmetries in physical systems.Group Theory has developed numerous techniques for studying groups such as homomorphisms (which allow us to compare two different groups) and cosets (which allow us to break up larger groups into smaller ones). It has also contributed greatly to abstract algebra by introducing concepts such as generators and normal subgroups which are now essential parts of any algebra course. It has been used extensively in many fields from physics (where it provides ways of studying symmetry) to cryptography (where it provides algorithms for encryption). Its applications can be seen across multiple disciplines including engineering where it offers techniques for designing efficient machines; biology where it helps classify species according to their reproductive patterns; and economics where group theory plays an important role in game theory. Group theory can seem quite daunting at first but its power lies within its simplicity – once you understand the basic principles you will find yourself exploring new questions about how groups behave which can lead down interesting paths that were previously unexplored.