Since it\'s complex to judge if a quiver is Hopf quiver only according to the definition,the paper proves that the quiver,with the vertex set of a cyclic group or integer additive group as its vertex set,is Hopf quiver of basic ramification number if and only if the adjacent matrix is the sum of the basic Hopf quiver matrix.

In this paper,graph properties of simple undirected Hopf quivers and the relation between path algebras and path coalgebras are discussed.

It is well known that Hopf quivers admit graded Hopf algebra structures.

In[3]and[6],the Hopf algebra structures of path algebra and path coalgebra on a Hopf quiver and a covering quiver respect to a weight sequence respectively were introduced independently.

The estimation of the fundamental matrix in computer vision;

Improved projection based M-estimators for fundamental matrix in stereovision;

Robust method for estimating the fundamental matrix;

A calculating formula of elementary solution matrix e~(At);