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A maximum value for the magnetic field is determined, which provides the fullcompensation of the positronium rest mass by the binding energy in the maximumsymmetry state and disappearance of the energy gap separating theelectron-positron system from the vacuum. The compensation becomes possibleowing to the falling to the center phenomenon. The maximum magnetic field maybe related to the vacuum and describe its structure.Comment: 4 pages, accepted for publication in Phys. Rev. Letter

Positronium Collapse and the Maximum Magnetic Field in Pure QED