Cinquièmes Journées Singulières


Fifth Singular Days
The Fichera corner

The Fichera corner is a cube minus a smaller cube.
It is the logo of these Singular Days because it is the prototype of a domain
where edge and corner singularities interact. It is named after Fichera who
was the first to give an approximation of its first corner singular exponent:
In 1973 he provided the bounds 0.4335 and 0.4645. Later, in 1993, the value
0.45418 was obtained by a boundary element method approximation

M.D. 11/09/2006