By Dickson, Leonard Eugene

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

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By the rank of a determinant is meant the rank of its matrix. T h e o r e m 5 . If A is any matrix with n columns and B is any matrix with n rows, any t-rowed determinant D of matrix AB is equal to a sum of terms each a product of a trrowed determinant of A by a trrowed determinant of B. Let A = (aiy), B = (6iy), P = AB = (pik) be given by (2), (5), (6). For the case n = 3, t = 2, the theorem is illustrated by the formula P l2 PlZ P22 P23 an dis Ö21 022 011 &12 + 012 &22 + 013 bz2 021 b i2 "t“ 022 &22 “ 1“ 023 &32 &12 bn + &22 &23 011 b i z + 012 &23 + 013 &33 021 &13 ” 1” 022 &23 “ 1“ 023 &33 an Ui3 612 b\z 021 023 bz2 bzz + O12 Oi3 &22 &23 022 023 bz2 bzz MATRICES, BILINEAR.

27. Bilinear forms. A polynomial in the m + n variables Xi,. . , xm, y\, . . , yn is called a bilinear form if each of its terms is of the first degree in the x’s and also of the first degree in the y ’s. An example with m = 1, n = 2, is 7xi yi — 5xi y2.

7m) = 0 is a syzygy between the invariants (see the examples in §12). B y means of a new variable zm+i, we may convert S (zi, . . , zm) into a homogeneous form H by multiplying a suitable power of zm+1 into all terms not of the maximum degree. By Hilbert’s theorem, the forms H are all expressible linearly in terms of a finite number Hi, . . , H k of them. Take zm+1 = 1. Thus (15) s ^ P 1S1+ ••• + P kS k, where P i , . . , P * are polynomials in zi, . . , zm. In this identity in zi , . . , Zm, we may take zx = Ih .

### Algebraic theories by Dickson, Leonard Eugene

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