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Table 2 The variation of \(\Re _{1}\) and \(\Re _{2}\) with respect to the delay parameters

From: Stability of an HTLV-HIV coinfection model with multiple delays and CTL-mediated immunity

Delay parameters \(\Re _{1}\) \(\Re _{2}\)
\(\ell _{1}=\ell _{2}=\ell _{3}=\ell _{4}=\ell _{5}=\ell _{6}=0\) 2.790 3.690
\(\ell _{1}=0.3\), \(\ell _{2}=0.4\), \(\ell _{3}=0.5\), \(\ell _{4}=0.6\), \(\ell _{5}=0.7\), and \(\ell _{6}=0.8\) 1.408 1.787
\(\ell _{1}=0.4\), \(\ell _{2}=0.5\), \(\ell _{3}=0.6\), \(\ell _{4}=0.7\), \(\ell _{5}=0.8\), and \(\ell _{6}=0.9\) 1.280 1.600
\(\ell _{1}=0.6\), \(\ell _{2}=0.7\), \(\ell _{3}=0.8\), \(\ell _{4}=0.9\), \(\ell _{5}=1\), and \(\ell _{6}=1.2\) 1.009 1.283
\(\ell _{1}=1\), \(\ell _{2}=1.5\), \(\ell _{3}=2\), \(\ell _{4}=2.5\), \(\ell _{5}=3\), and \(\ell _{6}=3.5\) 0.368 0.173
\(\ell _{1}=2\), \(\ell _{2}=3\), \(\ell _{3}=4\), \(\ell _{4}=5\), \(\ell _{5}=6\), and \(\ell _{6}=7\) 0.188 0.008
\(\ell _{1}=3\), \(\ell _{2}=4\), \(\ell _{3}=5\), \(\ell _{4}=6\), \(\ell _{5}=7\), and \(\ell _{6}=8\) 0.136 0.003
\(\ell _{1}=4\), \(\ell _{2}=6\), \(\ell _{3}=8\), \(\ell _{4}=9\), \(\ell _{5}=10\), and \(\ell _{6}=11\) 0.072 0.1 × 10−3
\(\ell _{1}=6\), \(\ell _{2}=7\), \(\ell _{3}=9\), \(\ell _{4}=10\), \(\ell _{5}=11\), and \(\ell _{6}=12\) 0.052 0.3 × 10−4
\(\ell _{1}=10\), \(\ell _{2}=11\), \(\ell _{3}=12\), \(\ell _{4}=13\), \(\ell _{5}=14\), and \(\ell _{6}=15\) 0.016 1.2 × 10−6