tip, 37
subgraph, 6
maps to, 10
subgroupoid, 7
supercore, of a graph, 6
take place in
Zo,
predivision, 38
folding, 40
Tardos, G., 19
terminal,
segment, 10
vertex, 5
term, 9
Thomas, S., 1
tip, 9
tip subdivision, 37
top stratum, 46
topological representative, 11
train track, 48
relative, 46
transpose, 27
transversal, 5
tree, 6
act on, 16
freely, 16
tree groupoid, 7
turn, 10
at a vertex, 10
element has, 10
mixed, 39
occur, 10
smooth, 47
vertex on, 10
Turner, E.C., 1, 2, 3, 16, 23, 68, 71, 72
universal cover, 24
valence, 6
vertex, 56
initial, 5
on a turn, 10
of graph, 5
of groupoid, 6
terminal, 5
turn at, 10
volume, 31.
weight, 33
Wielandt, H., 2, 28
zero irreducible matrix, 27
Zorn's Lemma, 14
INDEX 81
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