Recent content by Samoht

This partial derivative came up in my proof that the rate of strain in fluid dynamics is always positive. u is the velocity and I believe that there is summation but I am very new at this. The term I tried to prove being positive is: ∂iuj((∂iuj+∂jui)-2/3 ∂kuk δij) When I multiply ∂iuj...

I just handed in a homework where I used the assumption below ∂iuj∂jui=0 ? but when I start thinking about it I'm not so sure, could someone prove to me that it is zero? Or is that assumption totally off? Regards