Question:
Who was the chair of International Mathematical Union in Dec, 1988?

Context:
 Ingrid Daubechies is the chair of International Mathematical Union from Jan, 2011 to Jan, 2014. 
 Deane Montgomery is the chair of International Mathematical Union from Jan, 1975 to Jan, 1978. 
 Georges de Rham is the chair of International Mathematical Union from Jan, 1963 to Jan, 1966. 
 K. S. Chandrasekharan is the chair of International Mathematical Union from Jan, 1971 to Jan, 1974. 
 Jacques-Louis Lions is the chair of International Mathematical Union from Jan, 1991 to Jan, 1994. 
 Carlos Kenig is the chair of International Mathematical Union from Jan, 2019 to Dec, 2022. 
 Jürgen Moser is the chair of International Mathematical Union from Jan, 1983 to Jan, 1986. 
 Marshall Harvey Stone is the chair of International Mathematical Union from Jan, 1952 to Jan, 1954. 
 Shigefumi Mori is the chair of International Mathematical Union from Jan, 2015 to Jan, 2019. 
 Jacob Palis is the chair of International Mathematical Union from Jan, 1999 to Jan, 2002. 
 László Lovász is the chair of International Mathematical Union from Jan, 2007 to Jan, 2010. 
 Rolf Nevanlinna is the chair of International Mathematical Union from Jan, 1959 to Jan, 1962. 
 Ludvig Faddeev is the chair of International Mathematical Union from Jan, 1987 to Jan, 1990. 
 Lennart Carleson is the chair of International Mathematical Union from Jan, 1979 to Jan, 1982. 
 David Mumford is the chair of International Mathematical Union from Jan, 1995 to Jan, 1998. 
 Henri Cartan is the chair of International Mathematical Union from Jan, 1967 to Jan, 1970. 
 John M. Ball is the chair of International Mathematical Union from Jan, 2003 to Jan, 2006.

Answer:
Question:
Who was the chair of International Mathematical Union in Dec, 1988?

Context:
 Ingrid Daubechies is the chair of International Mathematical Union from Jan, 2011 to Jan, 2014. 
 Deane Montgomery is the chair of International Mathematical Union from Jan, 1975 to Jan, 1978. 
 Georges de Rham is the chair of International Mathematical Union from Jan, 1963 to Jan, 1966. 
 K. S. Chandrasekharan is the chair of International Mathematical Union from Jan, 1971 to Jan, 1974. 
 Jacques-Louis Lions is the chair of International Mathematical Union from Jan, 1991 to Jan, 1994. 
 Carlos Kenig is the chair of International Mathematical Union from Jan, 2019 to Dec, 2022. 
 Jürgen Moser is the chair of International Mathematical Union from Jan, 1983 to Jan, 1986. 
 Marshall Harvey Stone is the chair of International Mathematical Union from Jan, 1952 to Jan, 1954. 
 Shigefumi Mori is the chair of International Mathematical Union from Jan, 2015 to Jan, 2019. 
 Jacob Palis is the chair of International Mathematical Union from Jan, 1999 to Jan, 2002. 
 László Lovász is the chair of International Mathematical Union from Jan, 2007 to Jan, 2010. 
 Rolf Nevanlinna is the chair of International Mathematical Union from Jan, 1959 to Jan, 1962. 
 Ludvig Faddeev is the chair of International Mathematical Union from Jan, 1987 to Jan, 1990. 
 Lennart Carleson is the chair of International Mathematical Union from Jan, 1979 to Jan, 1982. 
 David Mumford is the chair of International Mathematical Union from Jan, 1995 to Jan, 1998. 
 Henri Cartan is the chair of International Mathematical Union from Jan, 1967 to Jan, 1970. 
 John M. Ball is the chair of International Mathematical Union from Jan, 2003 to Jan, 2006.

Answer:
user
Ludvig Faddeev
assistant
Question:
Who was the chair of International Mathematical Union in Dec, 1988?

Context:
 Ingrid Daubechies is the chair of International Mathematical Union from Jan, 2011 to Jan, 2014. 
 Deane Montgomery is the chair of International Mathematical Union from Jan, 1975 to Jan, 1978. 
 Georges de Rham is the chair of International Mathematical Union from Jan, 1963 to Jan, 1966. 
 K. S. Chandrasekharan is the chair of International Mathematical Union from Jan, 1971 to Jan, 1974. 
 Jacques-Louis Lions is the chair of International Mathematical Union from Jan, 1991 to Jan, 1994. 
 Carlos Kenig is the chair of International Mathematical Union from Jan, 2019 to Dec, 2022. 
 Jürgen Moser is the chair of International Mathematical Union from Jan, 1983 to Jan, 1986. 
 Marshall Harvey Stone is the chair of International Mathematical Union from Jan, 1952 to Jan, 1954. 
 Shigefumi Mori is the chair of International Mathematical Union from Jan, 2015 to Jan, 2019. 
 Jacob Palis is the chair of International Mathematical Union from Jan, 1999 to Jan, 2002. 
 László Lovász is the chair of International Mathematical Union from Jan, 2007 to Jan, 2010. 
 Rolf Nevanlinna is the chair of International Mathematical Union from Jan, 1959 to Jan, 1962. 
 Ludvig Faddeev is the chair of International Mathematical Union from Jan, 1987 to Jan, 1990. 
 Lennart Carleson is the chair of International Mathematical Union from Jan, 1979 to Jan, 1982. 
 David Mumford is the chair of International Mathematical Union from Jan, 1995 to Jan, 1998. 
 Henri Cartan is the chair of International Mathematical Union from Jan, 1967 to Jan, 1970. 
 John M. Ball is the chair of International Mathematical Union from Jan, 2003 to Jan, 2006.

Answer:
user
Shigefumi Mori
Henri Cartan
Georges de Rham
John M. Ball
Marshall Harvey Stone
K. S. Chandrasekharan
Deane Montgomery
Jürgen Moser
Lennart Carleson
Carlos Kenig
Ingrid Daubechies
Jacques-Louis Lions
Rolf Nevanlinna
Jacob Palis
László Lovász
David Mumford
assistant
Question:
Who was the chair of International Mathematical Union in Dec, 1988?

Context:
 Ingrid Daubechies is the chair of International Mathematical Union from Jan, 2011 to Jan, 2014. 
 Deane Montgomery is the chair of International Mathematical Union from Jan, 1975 to Jan, 1978. 
 Georges de Rham is the chair of International Mathematical Union from Jan, 1963 to Jan, 1966. 
 K. S. Chandrasekharan is the chair of International Mathematical Union from Jan, 1971 to Jan, 1974. 
 Jacques-Louis Lions is the chair of International Mathematical Union from Jan, 1991 to Jan, 1994. 
 Carlos Kenig is the chair of International Mathematical Union from Jan, 2019 to Dec, 2022. 
 Jürgen Moser is the chair of International Mathematical Union from Jan, 1983 to Jan, 1986. 
 Marshall Harvey Stone is the chair of International Mathematical Union from Jan, 1952 to Jan, 1954. 
 Shigefumi Mori is the chair of International Mathematical Union from Jan, 2015 to Jan, 2019. 
 Jacob Palis is the chair of International Mathematical Union from Jan, 1999 to Jan, 2002. 
 László Lovász is the chair of International Mathematical Union from Jan, 2007 to Jan, 2010. 
 Rolf Nevanlinna is the chair of International Mathematical Union from Jan, 1959 to Jan, 1962. 
 Ludvig Faddeev is the chair of International Mathematical Union from Jan, 1987 to Jan, 1990. 
 Lennart Carleson is the chair of International Mathematical Union from Jan, 1979 to Jan, 1982. 
 David Mumford is the chair of International Mathematical Union from Jan, 1995 to Jan, 1998. 
 Henri Cartan is the chair of International Mathematical Union from Jan, 1967 to Jan, 1970. 
 John M. Ball is the chair of International Mathematical Union from Jan, 2003 to Jan, 2006.

Answer:
user
Ludvig Faddeev
assistant