Rings and bilipschitz maps in normed spaces

We define the geometric modulus GM(A) of a ring A in a normed space And show that a set-bounded homeomorphism f: E→E is bilipschitz if and only if ⌈GM(A)-GM(fA)⌉ ≤ c for all rings A⊂E.Peer reviewe

Kolmiot konveksin etäisyyden tasoissa

The article deals with a plane equipped with a convex distance function. We extend the notions of equilateral and acute triangles and consider circumcenters of such triangles.Peer reviewe

Huomioita keskuspisteistä normitasoissa

Peer reviewe