Objective To study the treatment effects of chronic dacryoadenitis and obstruction of nasolacrimal duct by inverse planting silica gel tubes with spherical end.
Puffballs are named for the fact that puffs of spores are released when the dry and powdery tissues of the mature spherical fruiting body (basidiocarp) are disturbed.
In this paper, we show that the Pseudo-Symmetric property of spherical point set can be characterized by the eigen values of eigenpolynomial and it has the closeness under the metric sum operation.