Updates are available Correction dated 2026-01-20
Click to view Correction: https://doi.org/10.1007/s40010-025-00977-0
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Authors
Verma, Pratibha
Tiwari, Surabhi https://orcid.org/0000-0001-8269-0807
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Article History
Received: 18 September 2023
Revised: 6 July 2024
Accepted: 30 September 2025
First Online: 27 October 2025
Change Date: 31 December 2025
Change Type: Update
Change Details: The original online version of this article was revised as the summation symbol (Σ) were incorrect in all instances except in Equations (3) and (4). This should have been appeared as a curved gamma symbol (γ).
Change Date: 20 January 2026
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1007/s40010-025-00977-0
Declarations
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: The authors declare that they have no conflict of interest
: The AB derivative is a nonlocal fractional derivative with a nonsingular kernel. We have established the existence and uniqueness conditions of the solution for the proposed COVID-19 model using Picard’s operator, which is a contraction of the Banach spaces. For a more crucial and influential study, we have discussed the stability of the U-H types.
