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 Nov 21 answered Prove for Lp norm Aug 6 awarded Nice Question Jun 30 accepted Is there a way to prove a boolean operator isn't universal? Jun 29 comment Is there a way to prove a boolean operator isn't universal?But I can't rely on $W \ne Z$... Jun 29 revised Is there a way to prove a boolean operator isn't universal?added 41 characters in body Jun 29 comment Is there a way to prove a boolean operator isn't universal?Yes, question edited Jun 29 revised Is there a way to prove a boolean operator isn't universal?added 252 characters in body Jun 28 comment Is there a way to prove a boolean operator isn't universal?I've edited the question and added my specific operator. Surprisingly, it's also symmetric, and has the same result for different permutations Jun 28 revised Is there a way to prove a boolean operator isn't universal?adding the specific operator Jun 28 comment Is there a way to prove a boolean operator isn't universal?Why it's sufficient to show incompleteness "as long as we work with at most two sentence letters"? Jun 28 asked Is there a way to prove a boolean operator isn't universal? Jun 25 awarded Nice Question May 4 comment Why doesn't $\lim_{(x,y)\rightarrow(0,0)} xy\sin(\frac{1}{xy})$ exist?How to know when it's ok to take such $z$? or polar coordinates? May 4 accepted Why doesn't $\lim_{(x,y)\rightarrow(0,0)} xy\sin(\frac{1}{xy})$ exist? May 4 asked Why doesn't $\lim_{(x,y)\rightarrow(0,0)} xy\sin(\frac{1}{xy})$ exist? Apr 30 awarded Custodian Apr 30 revised Find all functions $F(x,y)$ such as $\frac{\sqrt{3}}{2}\frac{\partial{f}}{\partial{x}}+\frac{1}{2}\frac{\partial{f}}{\partial{y}}=0$added 8 characters in body; edited title Apr 30 reviewed Approve suggested edit on Find all functions $F(x,y)$ such as $\frac{\sqrt{3}}{2}\frac{\partial{f}}{\partial{x}}+\frac{1}{2}\frac{\partial{f}}{\partial{y}}=0$ Apr 30 asked Find all functions $F(x,y)$ such as $\frac{\sqrt{3}}{2}\frac{\partial{f}}{\partial{x}}+\frac{1}{2}\frac{\partial{f}}{\partial{y}}=0$ Apr 17 comment How to integrate a vector function in spherical coordinates?Thanks! much clearer now