Abstract
We show that the compactness of the difference of two cosine functions can be characterized by that of the difference of their resolvents. We also make some comparisons between such results for C0-semigroups and cosine functions.
Citation
Miao Li. B. Z. Guo. Serguei Piskarev. "COMPACTNESS AND NORM CONTINUITY OF THE DIFFERENCE OF TWO COSINE FUNCTIONS." Taiwanese J. Math. 7 (4) 575 - 589, 2003. https://doi.org/10.11650/twjm/1500407578
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