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The lower bound masses of the ground-state relativistic three-boson system in1+1, 2+1 and 3+1 space-time dimensions are obtained. We have considered areduction of the ladder Bethe-Salpeter equation to the light-front in a modelwith renormalized two-body contact interaction. The lower bounds are deducedwith the constraint of reality of the two-boson subsystem mass. It is verifiedthat, in some cases, the lower bound approaches the ground state bindingenergy. The corresponding non-relativistic limits are also verified.Comment: 14 pages, 4 ps-figures. To appear in J. of Phys.

Lower bound to the mass of a relativistic three-boson system in the lightcone