Edge sequences are usually used as igraph function arguments that
refer to edges of a graph.

An edge sequence is tied to the graph it refers to: it really denoted
the specific edges of that graph, and cannot be used together with
another graph.

An edge sequence is most often created by the `E()`

function. The
result includes edges in increasing edge id order by default (if. none
of the `P`

and `path`

arguments are used). An edge
sequence can be indexed by a numeric vector, just like a regular R
vector. See links to other edge sequence operations below.