 Hong Kong University, Oct. 39, 1993.
Given talk (19931006):
A survey of covering theory.
 Trento University (Italy), Sept. 24, 1995Sept. 6, 1996.
Given talk (19951024): A sketch of covering theory.
>
 Genova University (Italy), June 46, 1996.
Given talk (19960605):
Simple ideas for famous problems.
 Pisa University (Italy), July 1112, 1996.
Given talk (19960711):
Coverings of the integers and groups.
 Center for Combinatorics, Nankai University,
March 6August 16, 1999.
 Hong Kong University of Science and Technology, Feb. 28April 14, 2000.
 Chinese University of Hong Kong, April 7, 2000.
Given talk (20000407):
Various numbertheoretic quotients and related congruences.
 Hong Kong University, April 10, 2000.
Given talk (20000410):
Recent progress on covers of the integers
and their applications.
 City University of Hong Kong, April 14, 2000.
Given talk (20000414):
On Hilbert's tenth problem and related topics.
 Chinese University of Hong Kong, July 23August 22, 2000.
 Institute of Mathematics, Academia Sinica (Taiwan), May 1June 30, 2002.
Given talk (20020516):
Equalities and inequalities related to covers of $\Bbb Z$ or groups.
 National Sun Yatsen Univ. (Taiwan), May 2729, 2002.
Given talk (20020528):
On zerosum problems.
 National Taiwan Normal Univ. (Taiwan), June 12, 2002.
Given talk (20020612):
On the sum $\sum_{k\equiv r (mod m)}\binom{n}{k}$
and related results.
 National Taiwan Univ., June 24, 2002.
Given talk (20020624):
On the structure of periodic arithmetical maps.
 National Taiwan Univ., Nov. 412, 2002.
Given talk (20021106):
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 (20021111):
Snevily's conjecture on abelian groups and an
algebraic method in combinatorics.
 Kyushu University (Fukuoka, Japan), Nov. 1622, 2003.
Given talk (20031121):
How to unify covering systems, restricted sumsets and zerosum
problems.
 Northwest University (Xi'an, China), Feb. 1216, 2004.
Given talk (20040213):
Recent progress on zerosum problems and Snevily's conjecture.
 ICTP (International Centre for Theoretical Physics) (Trieste, Italy),
May 24June 12, 2004.
 Graz University (Graz, Austria), June 1319, 2004.
Given talk (20040614):
Covering systems and their connections to zerosum problems.
 Vienna University of Technology (Vienna, Austria), June 17, 2004.
Given talk (20040617):
On disjoint systems of residue classes or cosets of subgroups.
 Genova University (Genova, Italy), June 2025, 2004.
Given talk (20040623):
On the Erd\"osHeilbronn conjecture and Snevily's conjecture.
 Firenze Univ. (Florence, Italy), June 2628, 2004.
Given talk (20040628):
On various combinatorial sums and related identites.
 Univ. Roma "Tor Vergata" (Rome, Italy), June 2830, 2004.
Given talk (20040630):
Two localglobal theorems and a powerful formula.
 Institut Camille Jordan, Universit\'e
Claude Bernard LyonI (France), Jan. 11March 10, 2005.
A typical talk (20050113):
Identities and congruences for Bernoulli and Euler polynomials.
 Univ. SaintEtienne (France), Feb. 1, 2005.
Given talk (20050201):
Problems and results on covering systems.
 Univ. Bordeaux I (France), Feb. 1618, 2005.
Given talk (20050217):
Some effective results related to covers of Z and zerosum problems.
 Univ. California at Irvine (USA), May 13, 2005May 6, 2006.
Given talk (20050525):
Problems and results on covering systems.
Given talk (20051110):
On some conjectures of ErdosHeilbronn, Lev and Snevily.
Given talk (20060119):
A survey of zerosum problems on abelian groups.
 Univ. Wisconsin at Madison (USA), April 38, 2006.
Given talk (20060404):
Some curious results on Bernoulli and Euler polynomials
Given talk (20060406):
Recent progress on congruences involving binomial coefficients.
 Univ. Illinois at UrbanaChampaign (USA), April 1214, 2006.
Given talk (20060413):
Covering systems and periodic arithmetical functions.
 Massachusetts Institute of Technology (MIT, USA), April 2022, 2006.
Given talk (20060421):
Combinatorial aspects of covers of groups by cosets or subgroups.
 Zhejiang Univ., May 2428, 2006.
Given talk (20060526):
Some congruences motivated by algebraic topology.
 ECNU Workshop on qSeries (EastChina Normal Univ., June 21, 2006).
Given talk (20060621):
Some congruences concerning qEuler numbers,
qSalie numbers and qCarlitz numbers.
 Internat. Workshop on Finite Fields and their Appl. (Chenxing Math. Center, July 37, 2006).
Given talk (20060707):
padic orders of some sums involving binomial coefficients.
 The Fourth ChinaJapan Conf. on Number Theory (Shandong Univ., Weihai, Aug. 30Sept. 3, 2006).
Given talk (20060830):
Curious identities and congruences involving Bernoulli polynomials.
 Beijing Normal University, Jan. 25, 2007.
Given talk (20070125):
Problems and results on restricted sumsets.
 The Institute of Mathematics, Chinese Academy of Sciences (Beijing), Jan. 2230, 2007.
Given talk (20070130):
Combinatorial aspects of Szemeredi's theorem.
 Zhejiang University, April 58, 2007.
Given talk (20070406):
Additive combinatorics and Latin transversals.
 The Fourth CrossStrait Conf. on Graph Theory and Combin.
(National Taiwan Univ., Taipei, June 2427, 2007).
Given talk (20070624):
An additive theorem and restricted sumsets.
 National Cheng Kung University (Tainan), June 2829, 2007.
Given talk (20070628):
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 26, 2007).
Given talk (20070704):
An additive theorem related to Latin transversals.
 The 2007 Annual. Conference of the Chinese Math. Soc.
(Beijing, Nov. 14, 2007).
Invited talk (2007113):
Some famous problems and related results in combinatorial number theory.
 The 4th Int. Congress of the Chinese Mathematicians
(Zhejiang Univ., Hangzhou, Dec. 1722, 2007).
Invited talk (20071221):
Groups in combinatorial number theory.
 Tongji Univ., Shanghai, Jan. 1821, 2007.
Given talk (20080118):
Various extensions of some basic results in combinatorial number theory.
 The 6th Shanghai Conference on Combinatorics
(Shanghai Jiao Tong Univ., May 2428, 2008).
Plenary talk (20080528):
Recent problems and results involving binomial coefficients.
 Suzhou Univ., Suzhou, June 1820, 2008.
Given talk (20080619):
An extremal problem on covers of abelian groups.
 Nankai Univ., Tianjin, June 2325, 2008.
Given talk (20080624):
An extremal problem on covers of abelian groups.
 The Institute of Mathematics, Chinese Academy of Sciences (Beijing), June 2630, 2008.
Given talk (20070629):
Study covers of groups via characters and number theory.
 The 5th ChinaJapan Conf. on Number Theory (Kinki Univ., Osaka, Japan), August 27Sept.1, 2008.
Given talk (20080828):
On representations of integers involving triangular numbers.
 Dalian University of Technology, Dalian, Nov. 29Dec. 3, 2008.
Given talk (20081201):
An extremal problem on covers of abelian groups.
 Anhui Normal University, Wuhu, April 2225, 2009.
Given talk (20090423):
Some new conjectures involving primes.
 Ynacheng Normal College, Yancheng, Jiangsu Province, June 1417, 2009.
Given talk (20090616):
Some new conjectures involving primes.
 The Fifth CrossStrait Conf. on Graph Theory and Combin.
(Nankai Univ., Tianjin, July 28August 1, 2009).
Plenary (onehour) talk (20090731):
Probelms and results in additive combinatorics.
 International Conference on Number Theory and Representations
(Shandong Univ., Weihai, August 2August 7, 2009).
Given talk (20090803):
Polygonal numbers, primes and ternary quadratic forms.
 HarishChandra Research Institute (Jhusi, Allahabad, India), Jan. 16Feb. 16, 2010.
Six talks were given, here are the last three:
(Feb. 4, 2010)
On the DKSS technique and the DKSS conjecture.
(Feb. 6, 2010)
Some sophisticated applications of the Combinatorial Nullstellensatz.
(Feb. 8, 2010)
Conjectures and results on super congruences.
 Capital Normal University, Beijing, April 810, 2010.
Given talk (20100409):
Conjectures for super congruences and series for
π and other constants.
 The Second International Workshop on Number Theory, Combinatorics and their Interactions
(Luoyang Normal Univ., Luoyang, May 13, 2010).
Given talk (20100502):
Conjectures for super congruences and series for
π and other constants.
 Pacific Rim Conference on Mathematics
(Stanford University (USA), June 28July 2, 2010).
Invited talk (20100702):
Super congruences involving binomial coefficients and new series for
some famous constants.
 The National Center for Theoretical Sciences
(Hsinchu, Taiwan; August 1August 8, 2010).
Given talk (20100802):
Problems and results in additive combinatorics.
Given talk (20100804):
Arithmetic properties of combinatorial quantities.
 The National Chiao Tung University
(Hsinchu, Taiwan; August 5, 2010).
Given talk (20100805):
On divisibilitity concerning binomial coefficients.
 The 5th National Conference on Number Theory
(Zhaoqing, Guangdong, China; December 2528, 2010).
Given talk (20101227):
Correspondence between series and congruences.
 Shanghai Jiaotong University (March 1418, 2011).
Given talk (20110315):
padic congruences on combinatorial sums involving binomial coefficients,
Given talk (20110317):
padic congruences on combinatorial sums involving binomial coefficients (II).
 Zhejiang University
(Hangzhou, China; March 2426, 2011)
Given talks (20110325):
(1) On weighted extension of the ErdosHeilbronn conjecture,
(2) Dense subsets of the ring of padic integers and combinatorial congruences.
 Hsinghua University
(Beijing, China; April 1314, 2011).
Given talk (20110414):
Number theory behind series for 1/π.
 Institute of Mathematics, Chinese Academy of Sciences
(Beijing, China; April 15, 2010)
Given talk (20110415):
On the DKSS conjecture for finite abelian groups.
 Capital Normal University
(Beijing, China; April 15, 2011)
Given talk (20110415):
Determining
x^{2} mod
p^{2} with
4p=x^{2}+dy^{2}.
 Workshop in Combinatorics (Peking University, China; May 78, 2011)
Given talk (2011057):
On the DKSS conjecture for finite abelian groups.
 Chern Institute of Mathematics, Nankai University
(Tianjin, China; May 915, 2011)
Given talk (20110511):
Number theory behind series for 1/π.
 Shandong University
(Jinan, China; May 2426, 2010)
Given talk (20100525):
On the DKSS conjecture for finite abelian groups.
 Conference on Number Theory and relatd Fields
(Hefei and Huangshan, China; June 712, 2011)
Given talk (20100608):
Conjectures and results on
x^{2} mod
p^{2} with
4p=x^{2}+dy^{2}.
 The National Chiao Tung University
(Hsinchu, Taiwan; June 27July 2, 2011)
Given talk (20100628):
Combinatorial congruences via the Zeilberger algorithm.
 Institute of Mathematics, Academia Sinica (Taiwan), July 324, 2011.
Given talk (20110706):
On arithmetic properties of Bell numbers and Delannoy numbers.
Given talk (20110712):
Conjectures and results on generalized central trinomial
coefficients and Motzkin numbers.
Given talk (20110714):
Number theory behind series for 1/π.
 IShou University
(Kaohsiung, July 1819, 2011)
Given talk (20110719):
On the DKSS conjecture for finite abelian groups.
 The National Center for Theoretical Sciences
(Hsinchu, Taiwan; July 1922, 2011).
Given talk (20110720):
Some sophisticated congruences involving Fibonacci numbers.
 EastChina Normal University (Shanghai; Oct. 2729, 2011).
Given talk (20111029):
Number Theory behind Series for Powers of π.
 The 2nd National Conference on Combinatorial Number Theory (Guangzhou; Nov. 2426, 2011).
Given talk (20111125):
padic Congruences Motivated by Series.
 Jiangsu Normal University (Xuzhou; March 22, 2012).
Given talk (20120322):
On Functions Taking Only Prime Values.
 The Morningside Center of Mathematics (Beijing), April 1822, 2012.
Given talk (20120421):
On Functions Taking Only Prime Values and Related New Conjectures on Primes.
 Tsinghua University (Beijing), April 20, 2012.
Given talk (20120420):
Some Sophisticated Congruences involving Fibonacci Numbers.
 Workshop on Combinatorics and Graph Theory (Changsha; June 911, 2011).
Plenary talk (20120610):
Generate Primes in a Combinatorial Manner.
 The 5th National Conference on Combinatorics and Graph Theory (Luoyang; July 1619, 2011).
Plenary talk (20120718):
Primes from the Viewpoint of Combinatorics.
 University of Illinois at UrbanaChampaign, USA (July 23August 30, 2012).
Given talk (20120828):
Various New Observations about Primes.
 City University of New York, USA (August 2324, 2012).
Given talk (20120823):
padic Congruences Motivated by Series.
 Dalian University of Technology (Nov. 1415, 2012).
Given talk (20121115):
Refinements of Some Famous Problems on Primes.
 Dalian Maritime University (Nov. 1617, 2012).
Given talk (20121116):
Conjectures involving Arithmetical Sequences.
 Center for Combinatorics, Nankai University (Nov. 30Dec. 2, 2012).
Given talk (20121201):
The Riddle of Primes.
 Tsinghua University (April 12, 2013).
Given talk (20130412): Apery Numbers, Franel Numbers and Binary Quadratic Forms.
 The Morningside Center of Mathematics (Beijing), April 1315, 2013.
Given talk (20130413):
Sums of Consecutive Primes and Related Conjectures.
 Hong Kong University of Science and Technology (April 26May 5, 2013).
Given talk (20130502): Apery Numbers, Franel Numbers and Binary Quadratic Forms.
 Hong Kong University (May 3, 2013).
Given talk (20130503):
Some New Representation Problems involving Primes.
 Guangxi Normal University (June 2226, 2013).
Given talk (20130624):
Combinatorial Congruences via Zeilberger's Algorithm and Trees with Prime Vertices.
 The 5th International Symposium on Graph Theory and Combin. Algorithms (July 1215, 2012).
Given talk (20120714):
Combinatorial Congruences via Zeilberger's Algorithm and Trees with Prime Vertices.
 Zhejiang Univ. (Nov. 1417, 2013).
Given talk (20131115):
Determinants, Permutations and Additive Combinatorics.
 Xiamen Univ. (Dec. 1922, 2013).
Given talk (20131220):
Write n = k+m with f(k,m) Prime.
 Central China Normal Uni. (Jan. 25, 2014).
Given talk (20140103):
Congruences for Franel Numbers.
 Xiamen Univ. (March 2023, 2014).
Given talk (20140321):
Problems on Combinatorial Properties of Primes.
 Tsinghua Univ. (April 18, 2014).
Given talk (20140418):
Problems on Combinatorial Properties of Primes.
 The Morningside Center of Mathematics (Beijing), April 1620, 2014.
Given talk (20140419):
Determinants, Permutations and Additive Combinatorics.
 The 2nd Workshop on Combinatorics and Graph Theory (Changsha, June 12), 2014.
Given talk (20140602):
Determinants, Permutations and Additive Combinatorics.
 The Workshop on Analytic Number Theory and Cryptology (Beijing, June 1415), 2014.
Given talk (20140614):
On Some Arithmetic Functions.
 Institute of Mathematics, Academia Sinica (Taiwan), July 1529, 2014.
Given talk (20140724):
Determinants, Permutations and Additive Combinatorics.
 Impact of Computation on Number Theory (National Center of Theoretical Science, Hsinchu, July 30August 3), 2014.
Plenary talk (20140803):
Determinants, Permutations and Additive Combinatorics.
 National Center of Theoretical Science, Hsinchu, Taiwan, July 29August 10, 2014.
Given talk (20140806):
Towards the Twin Prime Conjecture.
 Northwest University, Xi'an, October 2528, 2014.
Given talk (20141026):
Towards the Twin Prime Conjecture.
Given talk (20141027):
Supercongruences Motivated by e.
 Center for Applied Mathematics, Tianjin Univ., Oct. 30Nov. 2, 2014.
Given talk (20141031):
Congruences for Franel Numbers.
 Center for Combinatorics, Nankai Univ., Tianjin, Nov. 34, 2014.
Given talk (20141103):
Towards the Twin Prime Conjecture.
 Jiangsu Normal Univ., Xuzhou, Jan. 811, 2015.
Given talk (20150109):
On generalized central trinomial coefficients.
 Capital Normal Univ., Beijing, April 1921, 2015.
Given talk (20150420):
On combinatorial properties of primes.
 Tsinghua Univ., Beijing, May 8, 2015.
Given talk (20150508):
On universal sums involving polygonal numbers.
 The Morningside Center of Mathematics (Beijing), May 711, 2015.
Given talk (20150510):
Consecutive primes and Legendre symbols.
 Dalian University of Technology, May 2831, 2015.
Given talk (20150529):
On generalized central trinomial coefficients.
 Connections in Discrete Mathematics (Simon Fraser Univ., Burnaby, Vancouver, Canada, June 1519, 2015).
Given talk (20150616):
On universal sums involving polygonal numbers.
 The 8th CrossStrait Conf. on Graph Theory and Comb.(National Sun Yatsen Univ., Kaohsiung, June 26July 2, 2015).
Given talk (20150628):
New divisibility results on certain sums of binomial coefficients.
 Suzhou University, January 1012, 2017.
Given talk (20170111):
The 135 conjecture and related topics.
 Jiangsu Normal University, March 1114, 2017.
Given talk (20170313):
Restricted sums of three or four squares.
 Institute of Mathematics, Chinese Academy of Sciences, April 1518, 2017.
Given talk (20170418):
Further results on Hilbert's tenth problem.
 Institute of Mathematics, Chinese Academy of Sciences, April 2124, 2017.
Given talk (20170422):
On threesquare theorem and its applications.
 Hebei Normal University, May 1316, 2017.
Given talk (20170515):
On Hilbert's tenth problem.
 The 5th National Conf. on Combin. Number Theory (Huaiyin Normal College, Sept. 1517, 2017).
Given talk (20170916):
On Hilbert's tenth problem.
 Northwest University, October 1821, 2017.
Given talk (20171019):
On the DKSS conjecture for finite abelian groups.
Given talk (20171020):
On the generalized central trinomial coefficients.
 The 9th Crossstrait Conf. on Graph Theory and Combin., November 25, 2017.
Plenary talk (2017113):
A survey of arithmetic properties of combinatorial quantities.
 Jiangsu University, November 2326, 2017.
Given talk (20171124):
On Snevily's conjecture and related topics.
 Shandong University, November 30December 3, 2017.
Given talk (20171201):
On Snevily's conjecture and related topics.
 The 3rd Workshop on Combinatorics and Graph Theory at Hunan University (Changsha, December 810, 2017).
Given talk (20171210):
On Snevily's conjecture and related topics.
 The 4th SichuanChongqing Workshop on Number Theory (Nanchong, December 2224, 2017).
Given talk (20171223):
On universal sums x(ax+b)/2+y(cy+d)/2+z(ez+f)/2.
 Southern Univ. of Sci. and Tech., Janunary 1113, 2018.
Given talk (20180112):
On covers of groups by cosets.
 Shenzhen Univ., January 13, 2018.
Given talk (20180113):
On universal sums x(ax+b)/2+y(cy+d)/2+z(ez+f)/2.
 Xia Univ., Jaunary 1416, 2018.
Given talk (20180115):
On Hilbert's tenth problem.
 Xia Univ., Jaunary 1416, 2018.
Given talk (20180115):
On Hilbert's tenth problem.
 Institute of Systems Science, Chinese Academy of Sciences, January 2830, 2018.
Given talk (20180129):
Problems and results on sums of squares.
 Conference on Combinatorics and its Applications (Harbin, May 1820, 2018).
Given talk (20180519):
Determinants, permutations and additive combinatorics.
 Wuhan Univ., June 1417, 2018.
Given talk (20180615):
Problems and results on sums of squares.
 Saint Petersburg Dept. of Steklov Math. Institute of Russian Academy of Sciencess (July 1530, 2018).
Given talk (20180719):
Determinants, permutations and additive combinatorics.
Given talk (20180720):
Problems and results on sums of squares.
 Summer Research Institute on qSeries (Tianjin, July 25August 15, 2018).
Given talk (20180814):
Historical remarks on my conjectural series.
Given talk (20180815):
On qanalogues of some identities and congruences.
 2018 Conference on Number Theory and its Applications (Yan'an, August 1922, 2018).
Given talk (20180820):
On some determinants involving Legendre or Jacobi symbols.
