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Some Generalizations of the Notion of Length
Authors:Kats  B A
Institution:(1) Kazan State Academy of Architecture and Building, Russia
Abstract:Two numerical characteristics of a nonrectifiable arc 
$$\gamma  \subset \mathbb{C}$$
generalizing the notion of length are introduced. Geometrically, this notion can naturally be generalized as the least upper bound of the sums 
$$\sum {\Phi (a_j )}$$
, where 
$${a_j }$$
are the lengths of segments of a polygonal line inscribed in the curve 
$$\gamma$$
and 
$$\Phi$$
is a given function. On the other hand, the length of 
$$\gamma$$
is the norm of the functional 
$$f \mapsto \int_\gamma  {f{\text{ }}dz{\text{ }}}$$
in the space 
$$C{\text{(}}\gamma {\text{)}}$$
; its norms in other spaces can be considered as analytical generalizations of length. In this paper, we establish conditions under which the generalized geometric rectifiability of a curve 
$$\gamma$$
implies its generalized analytic rectifiability.
Keywords:generalized rectifiability  length  Stieltjes integral  logarithmically convex functions
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