Read e-book online An Introduction to Mathematical Reasoning: Numbers, Sets and PDF

By Peter J. Eccles

ISBN-10: 0521597188

ISBN-13: 9780521597180

This ebook eases scholars into the trials of collage arithmetic. The emphasis is on figuring out and developing proofs and writing transparent arithmetic. the writer achieves this by means of exploring set conception, combinatorics, and quantity conception, issues that come with many basic principles and will now not join a tender mathematician's toolkit. This fabric illustrates how ordinary principles may be formulated conscientiously, offers examples demonstrating a variety of simple equipment of facts, and contains the various all-time-great vintage proofs. The e-book provides arithmetic as a always constructing topic. fabric assembly the desires of readers from quite a lot of backgrounds is integrated. The over 250 difficulties contain inquiries to curiosity and problem the main capable pupil but additionally lots of regimen routines to aid familiarize the reader with the fundamental rules.

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Extra info for An Introduction to Mathematical Reasoning: Numbers, Sets and Functions

Example text

1 and also the following useful results. e. (a > 0 and b > 0) or (a < 0 and b < 0). e. (a > 0 and b < 0) or (a < 0 and b > 0). Formally the right to left implications in these results come from the multiplicative law of inequalities and the left to right implications are proved by contradiction using the above table which shows, for example, that if a and b do not have the same sign then ab is not positive. 2). 1 Prove by contradiction that there do not exist integers m and n such that 14m +21n = 100.

1) 2 Hence x – x – 2 = 0 if and only if x = –1 or x = 2, as required. At this stage it is convenient to introduce two other ideas from set theory. 3 The symbol is the unique set which has no elements at all. It is denoted by the . Thus the statement that the quadratic equation x2 + 2x + 2 = 0 has no real solutions may be written Take care to distinguish ‘ ’ which is a variant of a Scandinavian letter from the Greek letter phi written ‘ ’. e. † It is important to distinguish between the symbols and although they are closely related as follows: If sets are defined by predicates then there is a correspondence between the notions of ‘implication’ and ‘subset’: the universal statement that for all a A is equivalent to the statement that the set is a subset of Notice that if A B and B C then A C since and together imply that Furthermore A for all sets A whereas A only if A = .

Too much detail can make a proof based possibly on one simple idea appear enormously complicated. It is, however, important not to use such phrases as a lazy way of avoiding thinking about the details. It is also the case that excessive pedantic precision can sometimes make mathematics hard to read. While learning to write good mathematics it is probably better to err on the side of pedantry. In this book arguments will often be presented first with lots of scaffolding (as ‘constructing a proof’) and then with the scaffolding removed (as ‘(formal) proofs’).

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An Introduction to Mathematical Reasoning: Numbers, Sets and Functions by Peter J. Eccles

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