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Two extensions of 1D Toda hierarchy
1D Toda hierarchy Ogawa
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2010/4/2
The extended Toda hierarchy of Carlet, Dubrovin and Zhang is reconsidered in the light of a 2+1D extension of the 1D Toda hierarchy constructed by Ogawa. These two extensions of the 1D Toda hierarchy ...
Metric Trees, Hyperconvex Hulls and Extensions
Hyperconvex spaces metric trees extensions
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2010/2/25
In this paper we examine the relationship between hyperconvex hulls and metric trees. After providing a linking construction for hyperconvex spaces, we show that the four-point property is inherited b...