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In sage, I performed the laplace transformation:

de=diff(y,t,2)-diff(y,x,2)==ksin(pix);de.laplace(t,s)

and got such a code:

s2L(y(x,t),t,s)?D0(x,t)2D[0,0]L(y(x,t),t,s)?sy(x,0)?D[0]L(y(x,t),t,s)D0,0(x,t)?D1(x,0)=sksin(?x)

Can someone tells me what "D0(x,t)2D[0,0]L(y(x,t),t,s)" and "D[0]L(y(x,t),t,s)D0,0(x,t)" means?
Thanks!

In sage, I performed the laplace transformation:

de=diff(y,t,2)-diff(y,x,2)==k*sin(pi*x);de.laplace(t,s)

and got such a code:

s^2L(y(x,t),t,s)-D[0](y)(x,t)2D[0,0]L(y(x,t),t,s)?sy(x,0)?D[0]L(y(x,t),t,s)D[0,0](y)(x,t)?D[1](y)(x,0)=sksin(?x)

Can someone tells me what "D0(x,t)2D[0,0]L(y(x,t),t,s)" D[0](y)(x,t)2D[0,0]L(y(x,t),t,s) and "D[0]L(y(x,t),t,s)D0,0(x,t)" means? D[0]L(y(x,t),t,s)D[0,0](y)(x,t) mean?
Thanks!