Equiareal

From Wikipedia, the free encyclopedia

Let M,N be surfaces in the Euclidean space \mathbb{R}^3. A smooth map f:M\rightarrow N is called equiareal if

|df_p(v)\times df_p(w)|=|v\times w|\,

for all p\in M and v,w\in T_pM, where the latter denotes the tangent space to M.

For some examples of such maps see map projection. For the case M = N = R x R, see equi-areal mapping.