| Abstract: | ln this paper, we prove Moser-Trüdinger inequality in any two dimensional manifolds. Let (M,g_M,) be a two dimensional manifold without boundary and (g, g_N) with boundary, we shall prove the following three inequalities: u∈H¹(M), suplimits_{and ||u||_{H¹(M)}}=1∫_M^{e^{4pi u²}<+∞} u∈H¹(M), suplimits_{∫_M u=0, and} ∫_M|∇u|²=1∫_M^{e^{4pi u²}<+∞} u∈H¹_0(N), suplimits_{and ∫_M|∇u²|=1∫_M^{e^{4pi u²}<+∞} Moreover, we shall show that there exist of extremal functions which at tain the above three inequalities. |
