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External approximation of first order variational problems via W-1,p estimates

Cesare Davini, Roberto Paroni (2008)

ESAIM: Control, Optimisation and Calculus of Variations

Here we present an approximation method for a rather broad class of first order variational problems in spaces of piece-wise constant functions over triangulations of the base domain. The convergence of the method is based on an inequality involving W - 1 , p norms obtained by Nečas and on the general framework of Γ-convergence theory.

Feedback in state constrained optimal control

Francis H. Clarke, Ludovic Rifford, R. J. Stern (2002)

ESAIM: Control, Optimisation and Calculus of Variations

An optimal control problem is studied, in which the state is required to remain in a compact set S . A control feedback law is constructed which, for given ε > 0 , produces ε -optimal trajectories that satisfy the state constraint universally with respect to all initial conditions in S . The construction relies upon a constraint removal technique which utilizes geometric properties of inner approximations of S and a related trajectory tracking result. The control feedback is shown to possess a robustness...

Feedback in state constrained optimal control

Francis H. Clarke, Ludovic Rifford, R. J. Stern (2010)

ESAIM: Control, Optimisation and Calculus of Variations

An optimal control problem is studied, in which the state is required to remain in a compact set S. A control feedback law is constructed which, for given ε > 0, produces ε-optimal trajectories that satisfy the state constraint universally with respect to all initial conditions in S. The construction relies upon a constraint removal technique which utilizes geometric properties of inner approximations of S and a related trajectory tracking result. The control feedback is shown to possess a robustness...

Fenomeni di concentrazione per energie di tipo Ginzburg-Landau

Ilaria Fragalà (2005)

Bollettino dell'Unione Matematica Italiana

Si discute il comportamento asintotico di energie di tipo Ginzburg-Landau, per funzioni da R n + k in R k , e sotto l'ipotesi che l'esponente di crescita p sia strettamente maggiore di k . In particolare, si illustra un risultato di compattezza e di Γ -convergenza, rispetto a una opportuna topologia sui Jacobiani, visti come correnti n -dimensionali. L'energia limite è definita sulla classe degli n -bordi interi M , e la sua densità dipende localmente dalla molteplicità di M tramite una famiglia di costanti di...

Filippov Lemma for matrix fourth order differential inclusions

Grzegorz Bartuzel, Andrzej Fryszkowski (2014)

Banach Center Publications

In the paper we give an analogue of the Filippov Lemma for the fourth order differential inclusions y = y”” - (A² + B²)y” + A²B²y ∈ F(t,y), (*) with the initial conditions y(0) = y’(0) = y”(0) = y”’(0) = 0, (**) where the matrices A , B d × d are commutative and the multifunction F : [ 0 , 1 ] × d c l ( d ) is Lipschitz continuous in y with a t-independent constant l < ||A||²||B||². Main theorem. Assume that F : [ 0 , 1 ] × d c l ( d ) i s m e a s u r a b l e i n t a n d i n t e g r a b l y b o u n d e d . L e t y₀ ∈ W4,1 b e a n a r b i t r a r y f u n c t i o n s a t i s f y i n g ( * * ) a n d s u c h t h a t ...

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