[" Show that Kis arrequivatenter a plane...

[" Show that Kis arrequivatenter a plane and let "R" be a relation in "S" defined by "],[" Let "S" be the set of all points in a phere "d(A,B)" is the distance between the "],[R=((A,B):d(A,B)<2" units),when "],[" points "A" and "B" ."],[" Show that "R" is reflexive and symmetric but not transitive."]

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