Home History Archives L.-S. Hahn 2023-2024: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2022-2023: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2021-2022: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2020-2021: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2019-2020: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2018-2019: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2017-2018: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2016-2017: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2015-2016: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2014-2015: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2013-2014: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2012-2013: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2011-2012: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2010-2011: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2009-2010: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2008-2009: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2007-2008: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2006-2007: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2005-2006: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2004-2005: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners 2003-2004: Problems1 Solutions1 Problems2 Solutions2 Speaker Winners