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I need to define

$y1(k)=\frac{y_{k+1}-y_{k-1}}{2*h}$

in sage so that sage can differ between symbolic $$y_{k+1}$$ and $$y_{k}$$ .

Would somebody please help?

I need to definedefine $$y1(k)=\frac{y_{k+1}-y_{k-1}}{2*h}$$

$y1(k)=\frac{y_{k+1}-y_{k-1}}{2*h}$

in sage so that sage can differ between symbolic $$y_{k+1}$$ and $$y_{k}$$ .

Would somebody please help?

I need to define $$y1(k)=\frac{y_{k+1}-y_{k-1}}{2*h}$$

in sage so that sage can differ between symbolic $$y_{k+1}$$ and $$y_{k}$$ .

Would somebody please help?