According to the influence of degenerate point configurations of projection matrix,the number of calibration correspondences and the track of user s head are improved.

An algorithm and use for point in-out polygon test based on reversed ray and vertex degenerateness;

Bifurcation of limit cycles for a class of degenerate singular point;

The complece and necessary conditions of the pointwise degeneracy RDDE;

This paper gives a pointwise degeneracy example in system of time-stagnancy of non-autonomy of one dimension.