By Thomas Heath

Quantity 1 of an authoritative two-volume set that covers the necessities of arithmetic and comprises each landmark innovation and each very important determine. This quantity beneficial properties Euclid, Apollonius, others.

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**Extra info for A History of Greek Mathematics, Volume 1: From Thales to Euclid**

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4. COMPOSITION ALGEBRAS 27 4 . 8 D e f i n i t i o n . A unital algebra A over a ring $ is quadratic if each element of A satisfies an equation of the form (22) x^ -t{x)x where t{x)^n(x) + n{x)l = 0 G $ . The elements t{x) and n{x) are known, respectively, as the trace and norm of x. The trace and norm of an element x ^ $ 1 are clearly unique. Upon defining (23) t{al) = 2a and n ( a l ) = a^ for Q; G ^ , we are assured t h a t t{x) and n ( x ) are uniquely defined for any X e A. Any algebra which arises from the Cayley-Dickson process is quadratic, with t(x) = X +'x and n{x) = x'x.

Suppose t h a t 0i is a pseudo-automorphism of a loop L with companion ci and t h a t 62 is a pseudo-automorphism with companion C2. (ci), OiR(ci)) and (^2? ^2-^(^2), ^2^(c2)) ^re autotopisms of L, hence so is their product, (11) (^1^2,a,a), where a = 6\R[ci)92R{c2). Now xa = {(X^i • C1)02}C2 = (a;^1^2){(ci^2) • C2} for x G L, because 62 is a pseudo-automorphism with companion C2. Thus a = 6\02R{c\62'C2) and (11) simply expresses the fact t h a t ^1^2 is a pseudo- automorphism of L, with companion c i ^ • C2.

2, we obtain b(ax) = (ba)x. Thus x G A/'p, so Afx C Afp, A similar argument gives the reverse inclusion and hence the equality of A/A and Afp, Now let X G A/"^. Then, for any a^b £ L, we have {ax)b = a{xb) and hence, by the left inverse property, PROOF. (13) b = {ax)-\a • xb) = (x~^a"^)(a • xb). Now let a^c ^ L. Since L is a loop, there exists b such that c = a - xb. By (13), 6 = ( x - ^ a - i ) c . On the other hand, x'^ia'^c) = x'^xb) = b. Thus {x~^a~^)c = x~^(a~^c), which shows that x~^ G Af\.

### A History of Greek Mathematics, Volume 1: From Thales to Euclid by Thomas Heath

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