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 Apr 11 awarded Informed Dec 6 comment Real Part of the Wave Function Yes, you are right @EmilioPisanty. Dec 6 answered Real Part of the Wave Function Dec 6 revised Equation of motion for cyclic model of the universe added 105 characters in body Dec 6 awarded Promoter Dec 5 comment Equation of motion for cyclic model of the universe I think that $\triangle\phi$ is zero and $\phi$ only depends on time @Trimok. Dec 4 comment Equation of motion for cyclic model of the universe Thanks very much, @Trimok. That explains the factor 4, but what about the sign? I read this article. In this paper the sign of the coupling term is negative. Which one is correct? Dec 4 revised Equation of motion for cyclic model of the universe added 654 characters in body Dec 3 revised Equation of motion for cyclic model of the universe added 141 characters in body Dec 3 asked Equation of motion for cyclic model of the universe Dec 18 accepted Proper times of two observers in a three-torus Dec 17 asked Proper times of two observers in a three-torus Dec 1 awarded Teacher Dec 1 revised Example of two linearly independent, nowhere vanishing vector fields in $\mathbb{R}^{2}$ edited body Dec 1 comment Example of two linearly independent, nowhere vanishing vector fields in $\mathbb{R}^{2}$ @dushya Yes, you are right. Nov 30 accepted Example of two linearly independent, nowhere vanishing vector fields in $\mathbb{R}^{2}$ Nov 30 answered Example of two linearly independent, nowhere vanishing vector fields in $\mathbb{R}^{2}$ Nov 30 comment Example of two linearly independent, nowhere vanishing vector fields in $\mathbb{R}^{2}$ @Luboš Motl I read somewhere that these fields cannot be a coordinate basis since the commutator does't vanish (like what we have in QM). But I don't know why. Nov 30 revised Example of two linearly independent, nowhere vanishing vector fields in $\mathbb{R}^{2}$ added 1 characters in body Nov 30 asked Example of two linearly independent, nowhere vanishing vector fields in $\mathbb{R}^{2}$