# Reachable

This crossword clue is for the definition: Reachable.
it’s A 9 letters crossword puzzle definition.
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## Possible Answers: AT HAND.

Last seen on: LA Times Crossword 3 May 19, Friday

### Random information on the term “Reachable”:

In matroid theory, a field within mathematics, a gammoid is a certain kind of matroid, describing sets of vertices that can be reached by vertex-disjoint paths in a directed graph.

The concept of a gammoid was introduced and shown to be a matroid by Hazel Perfect (1968), based on considerations related to Menger’s theorem characterizing the obstacles to the existence of systems of disjoint paths. Gammoids were given their name by Pym (1969) and studied in more detail by Mason (1972).

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Let G {\displaystyle G} be a directed graph, S {\displaystyle S} be a set of starting vertices, and T {\displaystyle T} be a set of destination vertices (not necessarily disjoint from S {\displaystyle S} ). The gammoid Γ {\displaystyle \Gamma } derived from this data has T {\displaystyle T} as its set of elements. A subset I {\displaystyle I} of T {\displaystyle T} is independent in Γ {\displaystyle \Gamma } if there exists a set of vertex-disjoint paths whose starting points all belong to S {\displaystyle S} and whose ending points are exactly I {\displaystyle I} .