By Dickson, Leonard Eugene

This in-depth advent to classical subject matters in better algebra offers rigorous, special proofs for its explorations of a few of arithmetic' most important techniques, together with matrices, invariants, and teams. Algebraic Theories reviews the entire very important theories; its broad choices variety from the principles of upper algebra and the Galois thought of algebraic equations to finite linear groups Read more...

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Cf. Glenn, Treatise on the Theory of Invariants, 1915, 175-208. Dickson, History of the Theory of Numbers, III, 1923, 293-301. 6Wilczynski, Proc. National Acad. Sciences, 4, 1918, 300-5. C hapter II I MATRICES, BILINEAR FORMS, LINEAR EQUATIONS Chapters III-V I, which are independent of I-I I, give a new exposition of the subject usually called higher algebra. We first develop Cayley’s calculus of matrices, and the essentially equiva lent subject of bilinear forms. The main theorems on the solu tion of systems of linear equations are not presupposed, but are deduced as corollaries.

Yfk arranged in any chosen order. Let A, B, . . denote the corresponding coefficients of the forms obtained by the transfor mation x = pu + qvy y = ru + svy D = ps — qr 5* 0. This replaces L by Yu — Uv, in which U = sX - q Y , V = - rX + pY. Solving these two equations, we get DX = pU + qVy DY = rU + sV. Let I = I (a, b, . . ; Xy Y) be of index Z. Then I (Ay By . . ; Uy V) = D l I = D l~nI (a, b, . . ; DXyD Y ), since / is of constant order n in X , Y. Hence I( AyBy. . ;Uy V) = D l~nI (a, by.

E x e r c is e Extend the finiteness proof to invariants of a system of binary forms First prove as in §14 that an invariant is annihilated by a0x pi + ... y b0x p 2 + . . , c0 x pz -b . . , . . 2 Q = d do — ----- b ddi ••* + d bo— - - b obi ••• + pz d bp^-i —----- b “ dbp2 d Co —----- b * • • crCi 34 COVARIANTS OF BINARY FORMS [Ch. II and by 2 0 . Next, if S is a polynomial in the at*, 6», . •which is of constant degree di in the a’s, of constant degree d* in the b’s, . . , and of total weight w in the a’s, b’s, .