Zhi Chao Huang

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This paper started as an attempt to organize geometrically various algebraic structures discovered in 2d quantum eld theory, see Witten and Zwiebach [45], Zwiebach [47], Lian and Zuckerman [29], Getzler [14, 15], Penkava and A. S. Schwarz [32], Horava [20], Getzler and J. D. S. Jones [16], Stashe [42, 43] and Huang [21]. The physical importance of these(More)