By Jonathan K. Hodge

To research and comprehend arithmetic, scholars needs to interact within the technique of doing mathematics. Emphasizing lively studying, Abstract Algebra: An Inquiry-Based Approach not just teaches summary algebra but additionally presents a deeper knowing of what arithmetic is, the way it is completed, and the way mathematicians imagine.

The ebook can be utilized in either rings-first and groups-first summary algebra classes. quite a few actions, examples, and routines illustrate the definitions, theorems, and ideas. via this enticing studying approach, scholars observe new principles and strengthen the required conversation talents and rigor to appreciate and follow innovations from summary algebra. as well as the actions and routines, every one bankruptcy features a brief dialogue of the connections between issues in ring concept and workforce concept. those discussions aid scholars see the relationships among the 2 major kinds of algebraic items studied through the text.

Encouraging scholars to do arithmetic and be greater than passive rookies, this article indicates scholars that the best way arithmetic is built is frequently various than the way it is gifted; that definitions, theorems, and proofs don't easily look totally shaped within the minds of mathematicians; that mathematical rules are hugely interconnected; and that even in a box like summary algebra, there's a significant volume of instinct to be found.

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Extra resources for Abstract Algebra. An Inquiry based Approach

Example text

In either case, S has a least element, which we will call r. It follows that r = b − aq for some q ∈ Z. Thus, we have found integers q and r such that b = aq + r. To show that 0 ≤ r < a, we will assume, to the contrary, that . ) This implies, however, that r − a ∈ S, since r − a ≥ 0 ? and r − a = (b − aq) − a = b − a(q + 1). But it is also the case that r − a < r, 0 ≤ r < a. To prove u ? and so we have arrived at a contradiction. It follows that , assume that there exist integers q ′ and r′ such that .

And r − a = (b − aq) − a = b − a(q + 1). But it is also the case that r − a < r, 0 ≤ r < a. To prove u ? and so we have arrived at a contradiction. It follows that , assume that there exist integers q ′ and r′ such that . and It follows that a(q − q ′ ) = r′ − r. But since 0 ≤ r′ < a and −a < −r ≤ 0, ? it is also the case that −a < r′ − r < a. Thus r′ − r is both an integer multiple of a and strictly between −a and a. As such, the only possibility is that r′ − r = , which implies that q − q ′ = as well.

Well, probably not. Even a child first learning about division would probably say that there are still more than 5 apples left, so we can take away another group of 5. This would leave 33 apples, and we could continue taking away groups of 5 apples until there were no longer 5 apples left to take away. Doing so would yield 8 groups of 5 apples, with 3 apples left over. Thus, we would say that 43 divided by 5 is 8 with a remainder of 3. Note that we could use an equation to express this relationship by writing 43 = 5 · 8 + 3.