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    COMBINATORICS
    2004
    93views more  COMBINATORICS 2004»
    On the Combinatorial Structure of Arrangements of Oriented Pseudocircles
    13 years 7 months ago
    On the Combinatorial Structure of Arrangements of Oriented Pseudocircles
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    We introduce intersection schemes (a generalization of uniform oriented matroids of rank 3) to describe the combinatorial properties of arrangements of pseudocircles in the plane ...
    Johann Linhart, Ronald Ortner
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    EJC
    2008
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    Embeddability of arrangements of pseudocircles into the sphere
    13 years 7 months ago
    Embeddability of arrangements of pseudocircles into the sphere
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    An arrangement of pseudocircles is a finite set of oriented closed Jordan curves each two of which cross each other in exactly two points. To describe the combinatorial structure ...
    Ronald Ortner
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