We utilize the reformulated equations of the classical theory, as derived by Banerjee et al.(J. Math. Anal. Appl. 175 (1993) 458), to establish mathematically, the existence of hydrodynamic instability in single diffusive bottom heavy systems, when considered in the more general framework of the boundary conditions of the type specified by Beavers and Joseph (J. Fluid Mech. 30 (1967) 197), in the parameter regime $T_0\alpha_2>1$, where $T_0$ and $\alpha_2$ being some properly chosen mean temperature and coefficient of specific heat (at constant volume) variation due to temperature variation respectively.
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