sentences:  Lyndon–Hochschild–Serre spectral sequence
  
  In mathematics, especially in the fields of group cohomology, homological algebra and number theory, the Lyndon spectral sequence or Hochschild–Serre spectral sequence is a spectral sequence relating the group cohomology of a normal subgroup "N" and the quotient group "G"/"N" to the cohomology of the total group "G".The spectral sequence is named after Roger Lyndon, Gerhard Hochschild, and Jean-Pierre Serre.