Electron-electron collisions at the future TESLA linear collider is a promising complement to e+e collisions. A critical issue for the physics potential of this option is the achievable luminosity. For e+e collisions, the pinch effect enhances the luminosity, while due to the repelling forces for ee collisions, the luminosity is significantly reduced and is more sensitive to beam separations. This report discusses the ee option for TESLA and the expected luminosity.

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