26 citations · 27 across the 3 of their papers we have counts for
3 papers
math.FA2025
A counterexample of the Fredholm of Toeplitz operator
Hua Liu, Xinyang Zhang
In this paper we study the essential spectra of the Toeplitz operator on the Hardy space . We give a counterexample to show that the Toeplitz operator with symbol is not Fredh…
astro-ph.EP2025★ 1 cited
The Spectrum of C/2023 A3 Indicates A Depleted Composition
Yunyi Tang, Shihao Wang, Zixuan Lin +4
We report a spectroscopic observation of comet C/2023 A3 using an 80 mm apochromatic (apo) refractor equipped with a custom-built spectrometer with a resolution of R~2,500 on the n…
gr-qc2023★ 26 cited
Rotating dark matter admixed neutron stars
John Cronin, Xinyang Zhang, Ben Kain
We study rotating compact stars that are mixtures of the ordinary nuclear matter in a neutron star and fermionic dark matter. After deriving equations describing a slowly rotating…