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## Main Question or Discussion Point

Can someone please exPlain to me what the phrase. Which metric do we have to impose in order that the mapping preserves distance means.

The example I have is

((-),phi)--->(x,y) =

(2a tan(theta/2)cos(phi) ,

2a tan(theta/2)sin(phi)) thanks

The example I have is

((-),phi)--->(x,y) =

(2a tan(theta/2)cos(phi) ,

2a tan(theta/2)sin(phi)) thanks