\show

Description 

Operator \show is the dual of \hide.
Operator \show allows to make visible previously hidden graphical elements. Elements given to the operator can be an edge or a vertices list. If an edge is given to show, the system checks that this edge had been defined (edges are defined by folds definition cf. §). If vertices are given, the system shows all edges containing one of them.
This operator should only appear within a step block.

Usage

  \show([a, b]);    % show the existing edge  between a and b
  \show(c);         % show all edges containing c
  \show(c, d, ab2); % show all edges containing c, d or ab2

Formal structure

  \show(EDGE);
  \show(VERTICES_LIST);

Parameters

  EDGE
  Description    : Indicates an explicit edge to show.
  Type           : Edge, couple of vertex identifiers.
  Allowed values : Any couple of vertex identifiers already 
                   defined in a previous step.
  VERTICES_LIST  : Vertices to show. In fact, show all edges that
                   contain those vertices.
  Type           : List of vertex symbols.
  Allowed values : Any sequence of vertex identifiers already 
                   defined in previous steps.