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单词 GeneralizedBezoutTheoremOnMatrices
释义

generalized Bézout theorem on matrices


Generalized Bézout theorem 1.

Let M[x] be an arbitrary matrix polynomial of order n and A a square matrixMathworldPlanetmath of the same order. Then, when the matrix polynomial is divided on the right (left) by the characteristic polynomialMathworldPlanetmathPlanetmath xI-A, the remainder is M(A) (M^(A)).

Proof.

Consider M[x] given by

M[x]=M0xm+M1xm-1++Mm,(M00).(1)

The polynomialMathworldPlanetmathPlanetmathPlanetmath can also be written as

M[x]=xmM0+xm-1M1++Mm.(2)

We are now substituting the scalar argument (real or complex) x by the matrix A and therefore (1) and (2) will, in general, be distinct, as the powers of A need not be permutable with the polynomial matrix coefficients. So that,

M(A)=M0Am+M1Am-1++Mm

and

M^(A)=AmM0+Am-1M1++Mm,

calling M(A) (M^(A)) the right (left) value of M[x] on substitution of A for x.
If we divide M[x] by the binomial xI-A (I is the correspondent identity matrixMathworldPlanetmath), we shall prove that the right (left) remainder R (R^) does not depend on x. In fact,

M[x]=M0xm+M1xm-1++Mm
=M0xm-1(xI-A)+(M0A+M1)xm-1+M2xm-2++Mm
=[M0xm-1+(M0A+M1)xm-2](xI-A)+(M0A2+M1A+M2)xm-2+M3xm-3++Mm
=[M0xm-1+(M0A+M1)xm-2+(M0A2+M1A+M2)xm-3](xI-A)
+(M0A3+M1A2+M2A+M3)xm-3+M4xm-4++Mm
=[M0xm-1+(M0A+M1)xm-2+(M0A2+M1A+M2)xm-3+
+(M0Am-1+M1Am-2++Mm-1)](xI-A)+M0Am+M1Am-1++Mm,

whence we have found that

R=M0Am+M1Am-1++MmM(A),

and analogously that

R^=AmM0+Am-1M1++MmM^(A),

which proves the theorem.∎

From this theorem we have the following

Corollary 1.

A polynomial M[x] is divisible by the characteristic polynomial xI-A on the right (left) without remainderiff M(A)=0 (M^(A)=0).

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更新时间:2025/5/4 21:16:29