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We extend an uncertainty principle due to Cowling and Price to threadlike nilpotent Lie groups. This uncertainty principle is a generalization of a classical result due to Hardy. We are thus extending earlier work on K" and Heisenberg groups. 2000 Mathematics subject classification: primary 22E25; secondary 43A30.doi:10.1017/s1446788700010144 fatcat:5cltoalwfvhxxkd72ag7ekwd6e