Delay Differential Model for Tumour-Immune Response with Chemoimmunotherapy and Optimal Control

Table 1

The stability results for the coexisting steady states by using the functions and , while fixing the rest of the parameters as mentioned in the text.

Region; in Figure 2			Steady state	Eigenvalues; , ,	Stability; for
Light blue; (1a)	0.1	0.05	(0.0269, 486.9244, 0.9999)		Stable node
Light blue; (1b)	1.4	0.1	(1.0299, 0.0238, 0.9999)	,	Stable spiral for ,; stable limit cycles at
Orange; (2)	0.2	0.23	(0.1648, 419.9672, 0.9999)		Stable node
			(0.8656, 79.7712, 0.99)		Unstable saddle node
Brown; (3)	0.6	0.1	(0.0789, 461.688, 0.99)		Stable node
			(0.7236, 148.7078, 0.99)		Unstable saddle node
			(1.0298, 0.0623, 0.99)	,	Stable spiral for ,; stable limit cycles at