Hi everyone,I have a function f=f(eta, bx, bt), in which diff(eta,x)=k(bx,bt)
and diff(eta,t)=-omega(bx,bt) withbx=delta*x and bt=delta^2*t. I want to
calculate the second order derivative diff(diff(f,x)). Theresult should be
k^2*D[0,0](f)+2*delta*k*D[0,1](f)+delta*D[0](k)*D[0](f)+delta^2*D[1,1](f).but
when I did as
follows:var('x,t,bx,bt,delta')bx=function('bx',x)bx=delta*xbt=function('bt',t)bt=delta^2*tk=function('k',bx,bt)omega=function('omega',bx,bt)eta=function('eta',x,t)f=function('f',eta,bx,bt)it
does not work. could anyone help me with that?Tanks in advanced!regards,YC
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