Existence and monotonicity property of minimizers of a nonconvexvariational problem with a second-order Lagrangian
2009
A variational problem
Minimize $\quad \int_a^bL(x,u(x),u'(x),u''(x))dx,\quad
u\in\Omega$
with a second-order Lagrangian is considered. In absence of any
smoothness or convexity condition on $L$, we present
an existence theorem by means of the integro-extremal technique.
We also discuss the monotonicity property of the minimizers.
An application to the extended Fisher-Kolmogorov model is included.
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