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Autor:
Fitzgerald, Tony, Massa, Judith M., Kelvey, Rob, Watts, Jennifer, Wheeler, John, Pontin, Joe, Clarke, Peter, Beech, Mark, Templeton, Karen, Thomas, Guy, Makin, Margaret, Milton, Lynda
Publikováno v:
BBC Countryfile; Aug2024, Issue 219, p92-94, 3p, 2 Color Photographs
Autor:
Kelvey, Robert J., Kelvey
In this dissertation, we study groups that act on twin trees. A twin tree consists of a pair of (infinite) simplicial trees (X+, X-) that are ``twinned" by means of a co-distance function δ*, which assigns a non-negative integer to pairs of vertices