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#### On infinite cycles II

We extend the basic theory concerning the cycle space of a
finite graph to arbitrary infinite graphs, using as infinite cycles
the homeomorphic images of the unit circle in the graph together
with its ends. We characterize the spanning trees whose fundamental
cycles generate the cycle space, and prove infinite analogues
to the standard characterizations of finite cycle spaces in terms
of edge-decomposition into single cycles and orthogonality to
cuts.

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