FUNCTION: uf_restriction - restriction of a unit form

CALLING SEQUENCE:
uf_restriction(q,v)

PARAMETERS:
q - matrix of the unit form
v - set of vertices to delete

SYNOPSIS:

• uf_restriction computes the restriction of the unit form q to support {1,...,n}\{v_i | i=1..vectdim(v)}

EXAMPLES:

> q:=uf_init([4,[1,2],[2,3],[3,4],[4,1]]);

> uf_type(q);

> q:=uf_restriction(q,[1]);

> uf_type(q);