By Yitzhak Katznelson and Yonatan R. Katznelson

ISBN-10: 0821844199

ISBN-13: 9780821844199

**Read or Download A (Terse) Introduction to Linear Algebra (Student Mathematical Library, Vol. 44) PDF**

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**Extra info for A (Terse) Introduction to Linear Algebra (Student Mathematical Library, Vol. 44)**

**Example text**

Notice that since [G,G] is a normal subgroup of G it actually equals the consequence of the commutators of G. 4) Any homom01phism of a group into an abelian group can be factored through the commutator quotient g'roup. 5) If a group G is generated by gl' g2' ... , then its commutator subgTOup [G,G] is the consequence of the commutators [gi,g;J, i, j = 1, 2, .... Proof. The consequence K of the commutators [g;,gj] is contained in every normal subgroup of G that contains {[gi,gj]}. Hence K c [G,G].

A presentation (x : r) is finitely generated if X is finite, finitely related if r is finite. A finite presentation is one that is both finitely generated and finitely related. A group is said to be finitely generated if it has at least one finitely generated presentation, finitely related if it has at least one finitely related presentation, finitely presented if it has at least one finite presentation. Although nonfinite presentations are common enough and by no means pathological, we shall be primarily concerned with finite sets x and r.

Thus the collection of presentations and presentation mappings forms a category. Moreover, 1* = 1 and (gf)* = g*f*. Presentation mappings fl,f2: (x : r) --+ (y : s) are homotopic, written fl c:::: f2' if, for every x in x, the elementfl(x)f2(x-l) belongs to the consequence of s. The condition for homotopy of presentation mappings can be restated: yfl(U) = yf2(U) for every u E F(x). 1) = f2*· Furthermore, We have seen that a presentation map f determines a homomorphism f*. 3) For each homomorphism 6: 1X : r 1--+ 1y : S I, there exists a presentation map f: (x : r) ->- (y : s) such that f* = 6.

### A (Terse) Introduction to Linear Algebra (Student Mathematical Library, Vol. 44) by Yitzhak Katznelson and Yonatan R. Katznelson

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