Sets of unique continuation for heat equation
  We study nodal lines of solutions to the heat equations. We are interested in the global geometry of nodal sets, in the whole domain of definition of the solution. The local structure of nodal sets is a well understander subject, while the global geometry of nodal lines is much less clear. We give a detailed analysis of a simple component of a nodal set of a solution of the heat equation. 
Nikolai Nadirashvili, Nadezda Varkentina
math.AP math-ph math.MP