We give a geometric definition of smooth toric Deligne-Mumford stacks using the action of a "torus". We show that our definition is equivalent to the one of Borisov, Chen and Smith in terms of stacky fans. In particular, we give a geometric interpretation of the combinatorial data contained in a stacky fan. We also give a bottom up classification in terms of simplicial toric varieties and fiber products of root stacks.
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Peking Univ, Beijing Int Ctr Math Res, 5 Yiheyuan Rd, Beijing 100871, Peoples R ChinaPeking Univ, Beijing Int Ctr Math Res, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
Fang, Bohan
Liu, Chiu-Chu Melissa
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Columbia Univ, Dept Math, 2990 Broadway, New York, NY 10027 USAPeking Univ, Beijing Int Ctr Math Res, 5 Yiheyuan Rd, Beijing 100871, Peoples R China
Liu, Chiu-Chu Melissa
Zong, Zhengyu
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Tsinghua Univ, Yau Math Sci Ctr, Jin Chuan Yuan West Bldg, Beijing 100084, Peoples R ChinaPeking Univ, Beijing Int Ctr Math Res, 5 Yiheyuan Rd, Beijing 100871, Peoples R China