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we-consider-that-application-n-1-det-M-n-R-R-A-det-A-1-verify-that-H-M-n-R-and-t-R-if-A-I-n-det-A-tH-1-t-Tr-H-t-2-suppose-that-A-GL-n-R-prouve-that-the-d




Question Number 134008 by AbderrahimMaths last updated on 26/Feb/21
    we consider that application n≥1    det : M_n (R)→R                        A det(A)  1−verify that ∀H∈M_n (R) and t∈R   if A=I_n ⇒det(A+tH)=1+t.Tr(H)+○(t)  2−suppose that: A∈GL_n (R)   prouve that the differntial of det in A is given by:     H Tr[(com(A))^T H]  3−determinate the differential of determinant of a matrix in general case.  (Use the density of GL_n (R) in M_n (R)   Tr: trace of matrix  (com(A))^T : transpose of the comatrix
weconsiderthatapplicationn1det:Mn(R)RAdet(A)1verifythatHMn(R)andtRifA=Indet(A+tH)=1+t.Tr(H)+(t)2supposethat:AGLn(R)prouvethatthedifferntialofdetinAisgivenby:HTr[(com(A))TH]3determinatethedifferentialofdeterminantofamatrixingeneralcase.(UsethedensityofGLn(R)inMn(R)Tr:traceofmatrix(com(A))T:transposeofthecomatrix

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