\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\square$$\end{document} In Theorem 5 , we show that a transcritical bifurcation of ( 4 ) exists, which is a highly significant mathematical mechanism underlying the epidemiological threshold.
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SEIRV epidemiological model for COVID 19 with Holling type II functional response.
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