Check biconnectedness

Tests whether a graph is biconnected.

Usage

is_biconnected(graph)

Arguments

graph

The input graph. Edge directions are ignored.

Value

Logical, TRUE if the graph is biconnected.

Details

A graph is biconnected if the removal of any single vertex (and its adjacent edges) does not disconnect it.

igraph does not consider single-vertex graphs biconnected.

Note that some authors do not consider the graph consisting of two connected vertices as biconnected, however, igraph does.

See also

articulation_points(), biconnected_components(), is_connected(), vertex_connectivity()

Connected components articulation_points(), biconnected_components(), component_distribution(), decompose()

Related documentation in the C library

igraph_is_biconnected().

Examples

is_biconnected(make_graph("bull"))
#> [1] FALSE
is_biconnected(make_graph("dodecahedron"))
#> [1] TRUE
is_biconnected(make_full_graph(1))
#> [1] FALSE
is_biconnected(make_full_graph(2))
#> [1] TRUE