- Hong Kong University, Oct. 3--9, 1993.
Given talk (1993-10-06):
A survey of covering theory.
- Trento University (Italy), Sept. 24, 1995--Sept. 6, 1996.
Given talk (1995-10-24): A sketch of covering theory.
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- Genova University (Italy), June 4--6, 1996.
Given talk (1996-06-05):
Simple ideas for famous problems.
- Pisa University (Italy), July 11--12, 1996.
Given talk (1996-07-11):
Coverings of the integers and groups.
- Center for Combinatorics, Nankai University,
March 6--August 16, 1999.
- Hong Kong University of Science and Technology, Feb. 28--April 14, 2000.
- Chinese University of Hong Kong, April 7, 2000.
Given talk (2000-04-07):
Various number-theoretic quotients and related congruences.
- Hong Kong University, April 10, 2000.
Given talk (2000-04-10):
Recent progress on covers of the integers
and their applications.
- City University of Hong Kong, April 14, 2000.
Given talk (2000-04-14):
On Hilbert's tenth problem and related topics.
- Chinese University of Hong Kong, July 23--August 22, 2000.
- Institute of Mathematics, Academia Sinica (Taiwan), May 1--June 30, 2002.
Given talk (2002-05-16):
Equalities and inequalities related to covers of $\Bbb Z$ or groups.
- National Sun Yat-sen Univ. (Taiwan), May 27--29, 2002.
Given talk (2002-05-28):
On zero-sum problems.
- National Taiwan Normal Univ. (Taiwan), June 12, 2002.
Given talk (2002-06-12):
On the sum $\sum_{k\equiv r (mod m)}\binom{n}{k}$
and related results.
- National Taiwan Univ., June 24, 2002.
Given talk (2002-06-24):
On the structure of periodic arithmetical maps.
- National Taiwan Univ., Nov. 4--12, 2002.
Given talk (2002-11-06):
On the sum $\sum_{k\equiv r (mod m)}\binom{n}{k}$
and related results.
- Institute of Mathematics, Academia Sinica (Taiwan), Nov. 11, 2002.
Given talk (2002-11-11):
Snevily's conjecture on abelian groups and an
algebraic method in combinatorics.
- Kyushu University (Fukuoka, Japan), Nov. 16--22, 2003.
Given talk (2003-11-21):
How to unify covering systems, restricted sumsets and zero-sum
problems.
- Northwest University (Xi'an, China), Feb. 12--16, 2004.
Given talk (2004-02-13):
Recent progress on zero-sum problems and Snevily's conjecture.
- ICTP (International Centre for Theoretical Physics) (Trieste, Italy),
May 24--June 12, 2004.
- Graz University (Graz, Austria), June 13--19, 2004.
Given talk (2004-06-14):
Covering systems and their connections to zero-sum problems.
- Vienna University of Technology (Vienna, Austria), June 17, 2004.
Given talk (2004-06-17):
On disjoint systems of residue classes or cosets of subgroups.
- Genova University (Genova, Italy), June 20--25, 2004.
Given talk (2004-06-23):
On the Erd\"os-Heilbronn conjecture and Snevily's conjecture.
- Firenze Univ. (Florence, Italy), June 26--28, 2004.
Given talk (2004-06-28):
On various combinatorial sums and related identites.
- Univ. Roma "Tor Vergata" (Rome, Italy), June 28--30, 2004.
Given talk (2004-06-30):
Two local-global theorems and a powerful formula.
- Institut Camille Jordan, Universit\'e
Claude Bernard Lyon-I (France), Jan. 11--March 10, 2005.
A typical talk (2005-01-13):
Identities and congruences for Bernoulli and Euler polynomials.
- Univ. Saint-Etienne (France), Feb. 1, 2005.
Given talk (2005-02-01):
Problems and results on covering systems.
- Univ. Bordeaux I (France), Feb. 16--18, 2005.
Given talk (2005-02-17):
Some effective results related to covers of Z and zero-sum problems.
- Univ. California at Irvine (USA), May 13, 2005--May 6, 2006.
Given talk (2005-05-25):
Problems and results on covering systems.
Given talk (2005-11-10):
On some conjectures of Erdos-Heilbronn, Lev and Snevily.
Given talk (2006-01-19):
A survey of zero-sum problems on abelian groups.
- Univ. Wisconsin at Madison (USA), April 3--8, 2006.
Given talk (2006-04-04):
Some curious results on Bernoulli and Euler polynomials
Given talk (2006-04-06):
Recent progress on congruences involving binomial coefficients.
- Univ. Illinois at Urbana-Champaign (USA), April 12--14, 2006.
Given talk (2006-04-13):
Covering systems and periodic arithmetical functions.
- Massachusetts Institute of Technology (MIT, USA), April 20--22, 2006.
Given talk (2006-04-21):
Combinatorial aspects of covers of groups by cosets or subgroups.
- Zhejiang Univ., May 24--28, 2006.
Given talk (2006-05-26):
Some congruences motivated by algebraic topology.
- ECNU Workshop on q-Series (East-China Normal Univ., June 21, 2006).
Given talk (2006-06-21):
Some congruences concerning q-Euler numbers,
q-Salie numbers and q-Carlitz numbers.
- Internat. Workshop on Finite Fields and their Appl. (Chenxing Math. Center, July 3--7, 2006).
Given talk (2006-07-07):
p-adic orders of some sums involving binomial coefficients.
- The Fourth China-Japan Conf. on Number Theory (Shandong Univ., Weihai, Aug. 30--Sept. 3, 2006).
Given talk (2006-08-30):
Curious identities and congruences involving Bernoulli polynomials.
- Beijing Normal University, Jan. 25, 2007.
Given talk (2007-01-25):
Problems and results on restricted sumsets.
- The Institute of Mathematics, Chinese Academy of Sciences (Beijing), Jan. 22--30, 2007.
Given talk (2007-01-30):
Combinatorial aspects of Szemeredi's theorem.
- Zhejiang University, April 5--8, 2007.
Given talk (2007-04-06):
Additive combinatorics and Latin transversals.
- The Fourth Cross-Strait Conf. on Graph Theory and Combin.
(National Taiwan Univ., Taipei, June 24--27, 2007).
Given talk (2007-06-24):
An additive theorem and restricted sumsets.
- National Cheng Kung University (Tainan), June 28--29, 2007.
Given talk (2007-06-28):
Sums of squares and triangular numbers, and Rado numbers for linear equations.
- The 19th Annual Int. Conf. on Formal Power Series and Algebraic Combin.
(Nankai Univ., Tianjin, July 2--6, 2007).
Given talk (2007-07-04):
An additive theorem related to Latin transversals.
- The 2007 Annual. Conference of the Chinese Math. Soc.
(Beijing, Nov. 1--4, 2007).
Invited talk (2007-11-3):
Some famous problems and related results in combinatorial number theory.
- The 4th Int. Congress of the Chinese Mathematicians
(Zhejiang Univ., Hangzhou, Dec. 17--22, 2007).
Invited talk (2007-12-21):
Groups in combinatorial number theory.
- Tongji Univ., Shanghai, Jan. 18--21, 2007.
Given talk (2008-01-18):
Various extensions of some basic results in combinatorial number theory.
- The 6th Shanghai Conference on Combinatorics
(Shanghai Jiao Tong Univ., May 24--28, 2008).
Plenary talk (2008-05-28):
Recent problems and results involving binomial coefficients.
- Suzhou Univ., Suzhou, June 18--20, 2008.
Given talk (2008-06-19):
An extremal problem on covers of abelian groups.
- Nankai Univ., Tianjin, June 23--25, 2008.
Given talk (2008-06-24):
An extremal problem on covers of abelian groups.
- The Institute of Mathematics, Chinese Academy of Sciences (Beijing), June 26--30, 2008.
Given talk (2007-06-29):
Study covers of groups via characters and number theory.
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