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Using the recently proposed density matrix renormalization group technique weshow that the magnons in the S=1 antiferromagnetic Heisenberg chain effectivelybehaves as bosons that condense at a critical field h_c.Comment: 12 pages, REVTEX 3.0, 3 postscript figures appended, UBCTP-93-00

Large-scale numerical evidence for Bose condensation in theS=1 antiferromagnetic chain in a strong field