By Ivar Ekeland, Roger Témam

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Any column containing a leading one has all other elements equal to zero. 1. Any nonzero matrix can be reduced by elementary row operations to reduced form echelon form. B Chapter 2. Identification 44 Let A (m x n) again denote the matrix whose null-space we wish to derive. Application of Gaussian elimination to (Α', Ιη) yields a square nonsingular matrix L, representing the elementary row operations, and a matrix R such that L'{A', In) = R where R is in reduced row echelon form. Since (Α', In) is of full row rank, R does not have zero rows.

The parameter matrix Σς is assumed to be unrestricted. 6). 2 The conventional model 49 where RBr is defined implicitly and is assumed to be of full row rank. Postmultiplication of the Jacobian by a conveniently chosen nonsingular matrix: B' Γ' j(B,n Rer ' 0 Imk 0 Im®B'- Jm®r' m RBr ®ΣΧ ' 0 . ^rnk . 7) has full column rank. Furthermore J(B, Γ) and J(B, Γ) share regular points. 2 we have the following result. 1. Let H = {(Β,Γ) \ ( β , Γ ) G R m2+mfc ,/>(ß, Γ) = 0} and let (β, Γ)° be a regular point of J(J5, Γ) | H, then (B, Γ)0 is locally identified if and only if J(B°, Γ0) has full row rank m2.

It is easy to see that a'2Nl = {di - cj, 0,0,0) 42 Chapter 2. Identification and Νψ,Ν,) (ela,2N1-(di-cj)I4)(e2,e3,e4) Γ o 0 0" 1 0 0 = (cj - di) 0 1 0 0 1 J = = ί° As a result, N2 = j(cj - di) Proceeding in a similar fashion, N3=j2(cj-dif 0 0 c -b 0 b 0 —a + b — d 0 -b Ν< = Ν5 = Ν6 = bj4(cj - di)4 bg-cf 0 -ag + bg-dg af-bf + df -bg + cf Consequently, for all regular points the rank of A equals 5 — 1 = 4. The zero on the second position of N6 indicates that column 2 of matrix A is independent of all the other columns.

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