Abstract
The quantum mechanics of a point particle on a noncommutative plane in a magnetic field is implemented in the present work as a deformation of the algebra which defines the Landau levels. I show how to define, in this deformed quantum mechanics, the physical observables, such as the density correlation functions and the Green function, on the completely filled ground level. Also it will be shown that the deformation changes the effective magnetic field which acts on the particles at long range, leading to an incompressible fluid with fractional filling of Laughlin type.
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