FUNCTION: mchwild - for a given bound poset algebra look for a poset of minimal chain sequences which is wild

CALLING SEQUENCE:
mchwild(a)
mchwild(a,s,p,m,c,incl,img)

PARAMETERS:
a - a completely separating bound poset algebra
s, p, m, c, incl, img - optional arguments evaluating to names

SYNOPSIS:

• mchwild constructs for each point s of the bound poset algebra a the poset of minimal chain sequences starting in s and tests whether this is wild.

• For mchwild to work properly, the algebra a has to be completely separating.

• Testing of the posets is done by looking for minimal wild (or hypercritical) subposets.

• If the procedure finds a wild poset, various information will be returned via the optional arguments. In particular:
  
  s - will be a point for which there is a poset of minimal chain sequences that is of wild representation type.
  
  p - will contain the poset structure of the poset belonging to s.
  
  m - a table containing for each minimal chain sequence in p the corresponding s-start set.
  
  c - will give the name of the hypercritical subposet of p found by the function.
  
  incl - a list containing data about the inclusion c --> p found by the function. In fact incl[i] is the image in p of the point i of c under this inclusion.
  
  img - a vector marking the points of p belonging to the image of c by 1, those not belonging to the image by 0.

EXAMPLES:

> a:=hypercritical_algd(7,2);

> mchwild(a,'s','p','m','c','incl','img');

> print(s);

> print(p);

> print(m);

> print(c);

> print(incl);

> print(img);