e/Backlund transform

Information
has gloss	eng: In mathematics, Bäcklund transforms or Bäcklund transformations relate partial differential equations and their solutions. They are an important tool in soliton theory and integrable systems. A Bäcklund transform is typically a system of first order partial differential equations relating two functions, and often depending on an additional parameter. It implies that the two functions separately satisfy partial differential equations, and each of the two functions is then said to be a Bäcklund transformation of the other.
lexicalization	eng: Backlund transform
lexicalization	eng: Baecklund transformation
lexicalization	eng: Baecklund transform
lexicalization	eng: Bäcklund transform
instance of	c/Exactly solvable models