Alon Shmiel
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 Jul2 awarded Curious Apr17 comment Explanation for the next steps of chaplygin dipole @JuanSimões, I'm sorry, I tried to understand it and I didn't succeed. I'm trying to find another material that is related to the link you posted. thank you from the deep of my heart! you help me a lot!! Apr17 comment Explanation for the next steps of chaplygin dipole @JuanSimões, ok, I will read about that. and you answered about that: "I think v is the two first elements of (2.2) [thanks to your link]. am I right?" thank you very much!! you don't know how much you help me to understand it! Apr17 comment Explanation for the next steps of chaplygin dipole @JuanSimões, wow, the first step is by definition! thanks! (2.3) is a choice (thank you again), and I guess (2.4) is also, right? so (2.5) is a derivative of which v (once by r and once by theta)? I think v is the two first elements of (2.2) [thanks to your link]. am I right? Apr17 comment Explanation for the next steps of chaplygin dipole @JuanSimões, thank you.. to be honest I didn't understand the step between (1.2) to (2.2). and why he chose the function of Psi and this Omega in (2.3)? thank you very much! Apr17 revised Explanation for the next steps of chaplygin dipole added 91 characters in body Apr17 asked Explanation for the next steps of chaplygin dipole Apr1 asked Sum of $\sum_{n=0}^\infty \frac{(x+2)^{n+2}}{3^n}$ Mar4 accepted proof of limits in math: if $a_n^3\to a^3$, then $a_n\to a$. Mar4 accepted Prove that if $|a_n-a_{n-1}| < \frac{1}{2^{n+1} }$ and $a_0=\frac12$, then $\{a_n\}$ converges to \$0