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Definitions and Examples : Groups, Abelian Groups and Non-Abelian Groups

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1. I need a simple definition of a
(1) group
(2) abelian group
(3) nonabelian group

2. Give one example of an abelian group and 2 examples of nonabelian groups.

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Definitions and Examples are provided for Groups, Abelian Groups and Non-Abelian Groups.

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need some simple examples.
________________________________________
1. I need a simple definition of a
(1) group

A group is a finite or infinite set of elements together with a binary operation (called the group operation) that together satisfy the four fundamental properties of closure, associativity, the identity property, and the inverse ...

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  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
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  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
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