Abstract
The (2+1)D Ising model on a triangular lattice is explored for lattices of up to 5*5 sites. Finite-size scaling techniques are used to estimate the critical parameters xc=0.2096(2), nu =0.627(4), beta =0.322(6), gamma =1.236(8). These agree with previous estimates, within errors, and with the hypotheses of universality and hyperscaling. The behaviour at low temperatures is also studied, and theoretical predictions of finite-size scaling at a first-order transition are confirmed.