Her thesis was titled " Functions Having Lines or Surfaces of Discontinuity ".
2.
Conditions are sought for the emergence of a surface of discontinuity ( of unit normal vector " \ textbf { n } " ) in the incremental stress and strain.
3.
Such an interface can neither absorb nor emit, because it is not composed of physical matter; but it is the site of reflection and transmission of radiation, because it is a surface of discontinuity of optical properties.
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