By Jonathan K. Hodge

ISBN-10: 1466567082

ISBN-13: 9781466567085

To examine and comprehend arithmetic, scholars needs to interact within the strategy of *doing *mathematics. Emphasizing energetic 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 booklet can be utilized in either rings-first and groups-first summary algebra classes. a variety of actions, examples, and workouts illustrate the definitions, theorems, and ideas. via this enticing studying approach, scholars become aware of new principles and boost the required conversation talents and rigor to appreciate and observe thoughts from summary algebra. as well as the actions and routines, each one bankruptcy features a brief dialogue of the connections between themes in ring thought and team thought. those discussions support scholars see the relationships among the 2 major sorts of algebraic gadgets studied in the course of the text.

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

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**Additional resources for Abstract Algebra. An Inquiry based Approach**

**Sample text**

Then use subtraction to obtain a new equation of the form a − b = . .. (c) Now assume that n | (a − b). Use your equation from part (b) to argue that n | (r1 − r2 ) as well. (d) Use the result you proved in part (c) to deduce that r1 = r2 . (Hint: Both r1 and r2 satisfy a certain inequality. 10 did you prove in parts (c) and (d)? What remains to be shown? (f) Use your equation from part (b) to prove that if r1 = r2 , then n | (a − b). 10. 10 is one of many results about congruence that we could prove using only what we have learned so far about divisibility.

Then a and b are said to be relatively prime if and only if gcd(a, b) = 1. 11 can be used to establish results involving relative primality. Please note that in this theorem, we use fractional notation to represent the unique quotient that results from dividing two integers. We would be wise to again heed the warning from page 13: this notation only makes sense when the denominator divides the numerator with a unique quotient (as is the case below). 14. Let a and b be integers, not both zero, and let d = gcd(a, b).

In the next two sections, we will consider techniques for proving each of these two aspects of the Fundamental Theorem. 3. In order to prove the existence portion of the Fundamental Theorem of Arithmetic, we will need to be able to precisely negate the definition of prime, and work with this negation in the context of an induction proof. The questions below foreshadow some of the ideas and techniques that we will use within our argument. (a) What does it mean for a positive integer n to not be prime?

### Abstract Algebra. An Inquiry based Approach by Jonathan K. Hodge

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