With the accelerated pace of urbanization, the construction of the city needs a large number of labor force, more and more farmers come out of the countryside to work in the city, forming a special group of migrant wo...With the accelerated pace of urbanization, the construction of the city needs a large number of labor force, more and more farmers come out of the countryside to work in the city, forming a special group of migrant workers. With the emergence of migrant workers groups, there has been a new generation of migrant workers. This article from the perspective ofintergenerational transfer of migrant workers poverty, social assistance as the breakthrough point, through the transfer phenomenon and social relief situation of migrant workers in poverty from generation to generation, according to international advanced experience put forward the blocking of migrant workers in the intergenerational transmission of poverty.展开更多
We determine all connected normal edge-transitive Cayley graphs on non-abelian groups with order 4p, where p is a prime number. As a consequence we prove if IGI = 25p, δ = 0, 1, 2 and p prime, then F 1 Cay（G, S） i...We determine all connected normal edge-transitive Cayley graphs on non-abelian groups with order 4p, where p is a prime number. As a consequence we prove if IGI = 25p, δ = 0, 1, 2 and p prime, then F 1 Cay（G, S） is a connected normal 1/2 arc-transitive Cayley graph only if G = F4p, where S is an inverse closed generating subset of G which does not contain the identity element of G and F4p is a group with presentation F4p = （a, b ｜aP = b4 = 1, b-lab = a^λ）, where λ2 = -1 （mod p）.展开更多
In [J. Algeb. Combin. 19(2004), 123-141], Du et al. classified the orientable regular embeddings of connected simple graphs of order pq for any two primes p and q. In this paper, we shall classify the nonorientable re...In [J. Algeb. Combin. 19(2004), 123-141], Du et al. classified the orientable regular embeddings of connected simple graphs of order pq for any two primes p and q. In this paper, we shall classify the nonorientable regular embeddings of these graphs, where p ≠ q. Our classification depends on the classification of primitive permutation groups of degree p and degree pq but is independent of the classification of the arc-transitive graphs of order pq.展开更多
A graph is called edge-transitive if its full automorphism group acts transitively on its edge set.In this paper,by using classification of finite simple groups,we classify tetravalent edge-transitive graphs of order ...A graph is called edge-transitive if its full automorphism group acts transitively on its edge set.In this paper,by using classification of finite simple groups,we classify tetravalent edge-transitive graphs of order p2q with p,q distinct odd primes.The result generalizes certain previous results.In particular,it shows that such graphs are normal Cayley graphs with only a few exceptions of small orders.展开更多
文摘With the accelerated pace of urbanization, the construction of the city needs a large number of labor force, more and more farmers come out of the countryside to work in the city, forming a special group of migrant workers. With the emergence of migrant workers groups, there has been a new generation of migrant workers. This article from the perspective ofintergenerational transfer of migrant workers poverty, social assistance as the breakthrough point, through the transfer phenomenon and social relief situation of migrant workers in poverty from generation to generation, according to international advanced experience put forward the blocking of migrant workers in the intergenerational transmission of poverty.
文摘We determine all connected normal edge-transitive Cayley graphs on non-abelian groups with order 4p, where p is a prime number. As a consequence we prove if IGI = 25p, δ = 0, 1, 2 and p prime, then F 1 Cay（G, S） is a connected normal 1/2 arc-transitive Cayley graph only if G = F4p, where S is an inverse closed generating subset of G which does not contain the identity element of G and F4p is a group with presentation F4p = （a, b ｜aP = b4 = 1, b-lab = a^λ）, where λ2 = -1 （mod p）.
基金support of National Natural Science Foun- dation of China (Grant No. 10971144)Natural Science Foundation of Beijing (Grant No. 1092010)
文摘In [J. Algeb. Combin. 19(2004), 123-141], Du et al. classified the orientable regular embeddings of connected simple graphs of order pq for any two primes p and q. In this paper, we shall classify the nonorientable regular embeddings of these graphs, where p ≠ q. Our classification depends on the classification of primitive permutation groups of degree p and degree pq but is independent of the classification of the arc-transitive graphs of order pq.
基金supported by National Natural Science Foundation of China (Grant Nos.11071210 and 11171292)
文摘A graph is called edge-transitive if its full automorphism group acts transitively on its edge set.In this paper,by using classification of finite simple groups,we classify tetravalent edge-transitive graphs of order p2q with p,q distinct odd primes.The result generalizes certain previous results.In particular,it shows that such graphs are normal Cayley graphs with only a few exceptions of small orders.
