By Lindsay N. Childs

ISBN-10: 0387745270

ISBN-13: 9780387745275

ISBN-10: 0387747257

ISBN-13: 9780387747255

This booklet is an off-the-cuff and readable advent to better algebra on the post-calculus point. The options of ring and box are brought via examine of the commonly used examples of the integers and polynomials. a robust emphasis on congruence sessions leads in a common strategy to finite teams and finite fields. the recent examples and idea are inbuilt a well-motivated model and made correct through many purposes - to cryptography, errors correction, integration, and particularly to trouble-free and computational quantity thought. The later chapters comprise expositions of Rabin's probabilistic primality try out, quadratic reciprocity, the class of finite fields, and factoring polynomials over the integers. Over a thousand routines, starting from regimen examples to extensions of idea, are discovered in the course of the ebook; tricks and solutions for lots of of them are incorporated in an appendix.

The re-creation comprises issues similar to Luhn's formulation, Karatsuba multiplication, quotient teams and homomorphisms, Blum-Blum-Shub pseudorandom numbers, root bounds for polynomials, Montgomery multiplication, and more.

"At each degree, a large choice of purposes is presented...The easy exposition is suitable for the meant audience"

- T.W. Hungerford, Mathematical Reviews

"The type is leisurely and casual, a guided journey in the course of the foothills, the consultant not able to withstand quite a few facet paths and go back visits to favourite spots..."

- Michael Rosen, American Mathematical Monthly

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Extra info for A Concrete Introduction to Higher Algebra

Example text

19. Find the greatest common divisor of: (i) 35 and 65, (ii) 135 and 156, (iii) 49 and 99. 20. Find the greatest common divisor of 17017 and 19210. 21. Find the greatest common divisor of 21331 and 43947. ) 22. Find the greatest common divisor of 210632 and 423137. ) 23. Show that for any number n, n and n + 1 are coprime. 24. Show that if a | b, then (a, b) = a. 25. Given numbers a and b, suppose there are integers r, s so that ar + bs = 1. Show that a and b are coprime. 26. Show that the greatest common divisor of a and b is equal to the greatest common divisor of a and −b.

The entries of Pascal’s triangle can be computed by the following: Lemma 12. c(n, r) = n! ) Proof. Induction on n. The case n = 0 is obvious: 0! 0! Given n > 0, assume that for all r with 0 ≤ r ≤ n − 1, c(n − 1, r) = Now c(n, 0) = 1 = n! (n − 0)! (n − 1)! (n − 1 − r)! c(n, n) = 1 = n! (n − n)! so the lemma is true for c(n, r) when r = 0 or n. For 1 ≤ r ≤ n − 1, c(n, r) = c(n − 1, r − 1) + c(n − 1, r) (n − 1)! (n − 1)! (n − r)! (n − 1 − r)! 1 (n − 1)! (n − 1 − r)! n − r r n (n − 1)! (n − 1 − r)!

Divide (110110011)2 into (1100000100101)2 using long division in base 2. 17. Divide (1, 4, 25, 46)60 by (1, 38)60 , using long division in base 60. Then multiply both numbers by 32 and do the division. Is it any easier? B. Greatest Common Divisors What do we mean by the greatest common divisor of two numbers? We deal with the three words, “greatest”, “common”, “divisor”, in reverse order: Let a, b be integers, with a not equal to zero. Say that a divides b, or a is a divisor of b, if b = aq for some integer q, that is, b is equal to some integer multiple of a.

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A Concrete Introduction to Higher Algebra by Lindsay N. Childs


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