A NOTE ON THE BASIC LEMMA OF THE LINEAR IDENTIFICATION PROBLEM
Oskar Maria Baksalary, Götz Trenkler · RePEc: Research Papers in Economics · 2010
In this note, the basic lemma of the linear identification problem is revisited. By utilizing a joint decomposition of orthogonal projectors as partitioned matrices, a new proof of the lemma is proposed. From the algebraic point of view, the present proof might be the simplest from among all available in the literature till now.