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A circle in Euclidean Geometry are all the point at same fixed distance (radius) from a single point called the center.

That fixed distance is only from every point to the center, but there are (obviously) different distances between point to point, by definition they are different points because they have a non-zero distance between them.

Well I wonder, (I've just imagine it and don't know if exist), an object of a special shape, of certain dimension, in a certain metric.. to have a single non zero distance between all points?

I mean, a shape/or metric, in wich points although perhaps they may have different distances between them, (as any known object in Euclides metric the circle, a plane, a sphere, a line, etc.), the special feature (or the special metric feature) would be that measuring those points from other metric, then all points are the same "distance" each other

thanks

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    Any 2 point space, or the vertices of an equilateral triangle would do. You might want to look up "discrete metric" to see if it answers your question.2011-11-05
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    Bouncing off of Jonas' answer, if you're interested in a geometric object that could "represent" a discrete metric space (of finite cardinality), you might try an [n-simplex](http://en.wikipedia.org/wiki/Simplex).2011-11-06
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    Bouncing off of robinhoode's comment, you could also try an [orthonormal set](http://en.wikipedia.org/wiki/Orthonormality) of arbitrary cardinality2011-11-06

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