Since the theory of mixed perverse sheaves was established in char p > 0 by Beilinson-Bernstein-Deligne-Gabber [3], it has been conjectured that there would exist objects in char 0 corresponding… Expand

Gangi and Shapiro (1977) proposed a recursive algorithm for determining coefficients of least‐squares polynomials. The algorithm is simpler and more efficient than Trench’s (1965) algorithm or… Expand

There are several reasons for investigating the inverse scattering problem in medical image processing. A typical case, that of ultrasonic fields, is considered. Assuming that a plane wave… Expand