The ground state energies of loosely bound boson and fermion trimers interacting via Lennardhyphen;Jones (12,6) pair potentials in two dimensions are evaluated with variational calculations. Threshold coupling constants for selfhyphen;binding are determined by extrapolation to zero binding energy. The results are used to give estimates of the binding energy of the4He trimer and in a discussion of the ordering of dimer and trimer thresholds in two dimensions.
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