equiareal mapping

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Equiareal — Let M,N be surfaces in the Euclidean space mathbb{R}^3. A smooth map f:M ightarrow N is called equiareal if:|df p(v) imes df p(w)|=|v imes w|, for all pin M and v,win T pM, where the latter denotes the tangent space to M.For some examples of such … Wikipedia
Map projection — A medieval depiction of the Ecumene (1482, Johannes Schnitzer, engraver), constructed after the coordinates in Ptolemy s Geography and using his second map projection A map projection is any method of representing the surface of a sphere or other … Wikipedia
2 × 2 real matrices — The set of 2 × 2 real matrices is denoted by M(2, R). Two matrices p and q in M(2, R) have a sum p + q given by matrix addition. The product matrix p q is formed from the dot product of the rows and columns of its factors… … Wikipedia

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