35Bxx Qualitative properties of solutions

• 35B05 General behavior of solutions of PDE (comparison theorems; oscillation, zeros and growth of solutions; mean value theorems)
  
• 35B25 Singular perturbations
  
• 35B35 Stability, boundedness
  
• 35B40 Asymptotic behavior of solutions
  
• 35B45 A priori estimates
  
• 35B60 Continuation and prolongation of solutions of PDE