SIAM Journal on Numerical Analysis, Vol. 44, No. 6 (2006), pp. 2389-2407 (19 pages) Characterizing the linear and local linear independence of the functions that span a linear space is a key task if ...
Let P and Q be two idempotents on a Hilbert space. In this note, we prove that the invertibility of the linear combination $\lambda_{1}P + \lambda_{2}Q$ is independent of the choice of $\lambda_{i}$, ...
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