Index

2-sum, 10

allowable triangle, 22

basepoint (of a 2-sum), 10

block, 18

block cut-vertex graph, 18

blocking sequence, 7

cofan, 6

connectivity

(n, k)-, 5

n-, 5

almost vertical 4-, 5

graph, 18

internal 4-, 5

vertical n-, 5

connectivity function, 5

cut-vertex, 18

cycle minor, 18

cyclomatic number, 18

Δ+,

4

39

Δ-Y operation, 15

Δ(M; T ), ∇(M

∗;

T ), 21

edge cut-set, 18

fan, 6

length, 6

fundamental graph, 6

good element (of a small separator), 45

legitimate set, 33

M¨ obius ladder

cubic, 23

quartic, 23

M¨ obius matroid

triadic, 24

triangular, 23

modular flat, 9

parallel connection, 9

pivoting on an edge, 7

rim edges, 23

rim elements, 24

separation

k-, 5

exact k-, 5

induced k-, 7

vertical k-, 5

separator

k-, 5

maximal small 3-, 44

maximal small vertical 3-, 44

small 3-, 43

small vertical 3-, 44

vertical k-, 5

spanning triad, 17

splitter, 8

spoke edges, 23

spoke elements, 24

T12, 9

tip, 24

triad, 5

triangle, 5

95