Higher-dimensional spherical geometries exist; see elliptic geometry. It is possible to tessellate in non-Euclidean geometries such as hyperbolic geometry. Higher dimensional symplectic geometries are defined analogously. Different symmetries form different groups with different geometries. This is a list of two-dimensional geometric shapes in Euclidean and other geometries. DNS is intractable for flows with complex geometries or flow configurations. This duality implies that strings propagating on completely different spacetime geometries may be physically equivalent. Abel transform is limited to applications with axially symmetric geometries. Similar results hold for other kinds of finite geometries. A fundamental problem in Ricci flow is to understand all the possible geometries of singularities. In three dimensions, there are eight models of geometries. Sintering alnico is suitable for complex geometries. He worked on mathematics of algebras, algebra of geometries, curve and dimension theory, etc. OFETs have been fabricated with various device geometries. Gao calculated formulas for different tip geometries.