This paper is concerned with singular curve and critical curve for the periodic doubly nonlinear Lane–Emden type equation
∂u∂t−divfalse(false|∇umfalse|p−2∇umfalse)=afalse(x,tfalse)uq. In 2010, under a convex assumption on the domain Ω, Wang et al. (2010) considered a partial case of
p−1