It is a relationship from one set (S) to another (T) - which need not be a different set such that for every element in S there is a unique element in T.
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The number of function is Geometry
One main characteristic of non-Euclidean geometry is hyperbolic geometry. The other is elliptic geometry. Non-Euclidean geometry is still closely related to Euclidean geometry.
molecular geometry is bent, electron geometry is tetrahedral
Molecular geometry will be bent, electron geometry will be trigonal planar
It has seesaw geometry.