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 Nov 12 comment Wen plaquette model with one kind of plaquette operator @NorbertSchuch So extensive GSD=gapless state? Nov 12 comment Wen plaquette model with one kind of plaquette operator @MengCheng Could you elaborate on why the phase is not gapped? Nov 11 comment Wen plaquette model with one kind of plaquette operator As you know, Wen's plaquette model is nothing but the toric code and you can transform it into a version with plauqette operators $\sigma^z$ $\sigma^z$ $\sigma^z$ $\sigma^z$ on even sublattice and $\sigma^x$ $\sigma^x$ $\sigma^x$ $\sigma^x$ on odd sublattice. I am here asking what if you are left with only one on all plaquettes? Nov 1 comment Mean field approach to toric code Is u in the mean field theory a constant from the other expectation values or should it depend on the position $ij$ of the link? Oct 31 comment Mean field approach to toric code What is the relation of Majorana fermions dimerized and the spectrum being gapped? Oct 31 comment Mean field approach to toric code Thanks Everett for the detailed answer. By the way, do you know where can I look into for reference about all the results listed in your last paragraph? Feb 14 comment Wick's theorem for calculating OPE I guess I am just confused about what exactly should $T(z)\partial_z \phi$ be equal to using Wick's theorem. Sep 11 comment Laplacian of a delta function as an interaction potential for Laughlin state I am aware of that definition, but I don't think that is quite equivalent to a two dimensional delta function, maybe a delta function for analytic complex functions. Sep 11 comment Laplacian of a delta function as an interaction potential for Laughlin state The situation I am concerned is that when you treat the delta function as a limiting case of a Gaussian function(say if we want to investigate the interaction range for this Laplacian of the delta function), then if z is the only variable wouldn't make sense. May 29 comment The bijective correspondence between a symmetric polynomial and edge excitation of the fractional quantum hall droplet Thanks for clearing that part up, Prof. Wen. I am glad that I can directly ask you question this way. I do have one more question on that fascinating paper. The wave function $\prod_i (1-\frac{z_i}{\xi})^n$ you proposed for the interaction between a outside 'charge' n at $\xi$ and the FQH droplet, can we just thought that as a 'charge' n/m quasihole, since the wave function will be almost the same. Feb 2 comment Pair correlation function for a inhomogeneous Laughlin droplet Any paper on that I can read about? Apr 12 comment $\theta$ term of anomaly related with topological insulators Could you explain a little more how this is related to the Chern-Simon term?