Baksalary, Oskar Maria; Trenkler, Gotz - In: Journal of Quantitative Economics 8 (2010) January, pp. 162-166
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...