J. Mirzov
abstract:
For a system of differential inequalities we present exact conditions for
non-existence of global solutions of constant sign in subcritical and critical
cases. In the supercritical case we indicate one sufficient condition for
non-existence of global solutions of constant sign which is, possibly, also
exact.
Mathematics Subject Classification: 34C10.
Key words and phrases: System of differential inequalities, global solution of constant sign, non-existence.