corona problem
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Author(s):  
Rana Putri Kurniawan ◽  
Muhammad Alvin Giffary ◽  
Wendy Marbun

The pandemic that is endemic throughout the world is making every country work hard to eradicate it. has been declared by the World Health Organization (WHO) as a Global Public Health Emergency which is known to spread to all corners of the world very quickly. Coronavirus is a new virus that causes illness ranging from mild to severe symptoms. There are at least two types of corona viruses that cause serious illness, namely Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS). Coronavirus disease 2019 (COVID-19) is a new disease that has never been identified in humans. The virus that causes is called SarsCoV2. COVID-19 is a new disease and there is very little research on it. Evidence-based information is required for the care, treatment and other information related to this disease. The Indonesian government later declared the Corona problem as an unnatural or non-natural national disaster. The President of the Republic of Indonesia, regional governments and their staff work together in various efforts to prevent the spread of the virus in the community. From ministerial level to province, district or city Keywords: Pandemic, Local Government, Efforts  


2021 ◽  
Vol 41 (6) ◽  
pp. 843-848
Author(s):  
Sebastian Gwizdek

Nearly 60 years have passed since Lennart Carleson gave his proof of Corona Theorem for unit disc in the complex plane. It was only recently that M. Kosiek and K. Rudol obtained the first positive result for Corona Theorem in multidimensional case. Using duality methods for uniform algebras the authors proved "abstract" Corona Theorem which allowed to solve Corona Problem for a wide class of regular domains. In this paper we expand Corona Theorem to strictly pseudoconvex domains with smooth boundaries.


2017 ◽  
Vol 121 (1) ◽  
pp. 121
Author(s):  
Nikolai Nikolski

Given data $f=(f_1,f_2,\dots ,f_n)$ in the holomorphic part $ A= F_+$ of a symmetric Banach\slash topological algebra $ F$ on the unit circle $\mathbb{T}$, we estimate solutions $ g_j\in A$ to the corresponding Bezout equation $\sum _{j=1}^ng_jf_j=1$ in terms of the lower spectral parameter δ, $0< \delta \leq |f(z)|$, and an inversion controlling function $c_1(\delta ,F)$ for the algebra $F$. A scheme developed issues from an analysis of the famous Uchiyama-Wolff proof to the Carleson corona theorem and includes examples of algebras of “smooth” functions, as Beurling-Sobolev, Lipschitz, or Wiener-Dirichlet algebras. There is no real “corona problem” in this setting, the issue is in the growth rate of the upper bound for $\|g\|_{A^n}$ as $\delta \to 0$ and in numerical values of the quantities that occur, which are determined as accurately as possible.


2017 ◽  
Vol 108 (6) ◽  
pp. 609-619 ◽  
Author(s):  
Dmitry V. Rutsky
Keyword(s):  

2016 ◽  
Vol 86 (4) ◽  
pp. 495-544
Author(s):  
Eric T. Sawyer ◽  
Brett D. Wick

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