Is this du^2/dx1^2 the common 2nd derivative? For convention, the notation for the 2nd derivative I noticed is d^2 u/d x1^2
@echo No, it's just a typo (and a pretty bad one, since it suggests you might be differentiating the function $u^2$ instead of $u$).
Is this du^2/dx1^2 the common 2nd derivative? For convention, the notation for the 2nd derivative I noticed is d^2 u/d x1^2
@echo No, it's just a typo (and a pretty bad one, since it suggests you might be differentiating the function $u^2$ instead of $u$).