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math.FA2025
Direct Sum of Lower Semi-Frames in Hilbert Spaces
Hemalatha M, P. Sam Johnson, Harikrishnan P. K
In this paper, structural properties of lower semi-frames in separable Hilbert spaces are explored with a focus on transformations under linear operators (may be unbounded). Also,…
math.FA2025
Some spectral results for certain positive operators in Hilbert Spaces
Rashid A., P Sam Johnson
This paper investigates spectral properties of certain classes of positive operators originated from different matrices appeared in linear complementarity problem. These positive o…