Concept

Relation de commutation canonique

Publications associées (46)

On duality of canonical representations

Every convex polyhedron in

R^d

admits both H- and V-representations. In both cases, a representation is defined to be canonical if it is minimal and unique up to simple transformations. In general, canonical H- and V-representations are discussed separat ...

2004

On canonical representations of convex polyhedra

Stefano Picozzi

Every convex polyhedron in the Euclidean space

R^d

admits both H-representation and V-representation. When working with convex polyhedra, in particular large-scale ones in high dimensions, it is useful to have a canonical representation that is minimal a ...

2002

Topologic study of a magnetic perturbation in a 3D free boundary plasma equilibrium

Wilfred Anthony Cooper

We have investigated the topological modification of an equilibrium with nested magnetic flux surfaces computed with the free boundary variational moments equilibrium code (VMEC) subject to an applied magnetic field perturbation. Magnetic field lines are t ...

1998

Relativistic guiding centre drift orbits in canonical and magnetic coordinates

Wilfred Anthony Cooper

The Hamiltonian formulation of the guiding centre drift orbits for three-dimensional (3D) toroidal configurations with general time-dependent electric and magnetic field structures has been extended to cover relativistic particles. For static 3D magnetic f ...

1997

Bilinear time-frequency representation of signals: The shift-scale invariant class

Rüdiger Urbanke

The class of bilinear time-frequency representations (BTFR's) that are invariant (or covariant) to time shifts, frequency shifts, and time-frequency scalings. This shift-scale invariant class is the intersection of the classical shift-invariant (Cohen) cla ...

1994

Geometrical and mathematical aspects of the adiabatic theorem of quantum mechanics

This work is devoted to rigorous results about the adiabatic theorem of quantum mechanics. This theorem deals with the time dependent Schrödinger equation when the hamiltonian is a slowly varying function of time, characterizing the so-called adiabatic reg ...

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On duality of canonical representations

Stefano Picozzi

Every convex polyhedron in

R^d

2004