29-31 August 2002, Le Tronchet, France
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