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The Sivers Function is briefly reviewed and the Collins FragmentationFunction to produce a hadron from a polarized quark is defined. We estimate$\pi^{+},\pi^{-}$ +X production, where X represents particles which are notdetected, via proton collisions with a polarized proton target using theCollins Fragmentation Function derived using the gluon distribution functionsfor polarized p-p collisions at E=$\sqrt{s}$=200 GeV.

Transversly Polarized Proton-Proton Collisions and the Collins Fragmentation Function