Abstract. The spectra of the 2 × 2 upper triangular operator matrix M C =( A C 0 B ) acting on a Hilbert space 𝐻₁ ⨁ 𝐻₂ are investigated. We obtain a necessary and sufficient condition of 𝜎(𝑀𝐶) = ...

Abstract: This paper mainly studies the fault estimation for a class of interconnected systems with simultaneous dynamic uncertainties and actuator faults. A lower triangular matrix based linear ...

In the paper, the authors establish two identities to express higher order derivatives and integer powers of the generating function of the Chebyshev polynomials of the second kind in terms of integer ...