The π Near Frattini Subgroups of Infinite Groups
lv zhi-ying1; 2; zhang zhi-rang1; zhao guang-wu11.college of mathematics; chengdu university of information technology; chengdu 610225; china; 2.college of science; qiqihaer university; qiqihaer heilongjiang 161006; chin
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Study of Changes in Vegetation Coverage in Beibei District of Chongqing Based on TM Images
lan ming-juan; wei hong; xiong chun-ni; zhou chen-ni1.school of life science; southwest university; chongqing 400715; china; 2.key laboratory of eco-environments of three gorges reservoir region(ministry of education); chongqing 400715; china; 3.key laboratory of plant ecology and resources research in three gorges reservoir region; chongqing; 400715; china
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The Chromatic Uniqueness of the Dense Graph ■
wang jian-feng1; wang jing2; ye cheng-fu11.department of mathematics and information science; qinghai normal university; xining 810008; china; 2.department of mathematics and physics; hebei normal university of science and thechnology; qinhuangdao hebei 066004; china
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