Joins of oriented matroids

@article{Hochstttler2011JoinsOO,
  title={Joins of oriented matroids},
  author={Winfried Hochst{\"a}ttler and Robert Nickel},
  journal={Eur. J. Comb.},
  year={2011},
  volume={32},
  pages={841-852}
}
We define series/parallel/2-sum connections of two oriented matroids in terms of various axiom systems and an oriented modular join and sum operation by means of signed cocircuits and covectors. 
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