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The inverse of $D$ will form a matrix such that The diagonal of the inverse of $D$ is $1$ (for $i=1,2,...n$) $$ D(i,i) = 1 $$ and for $i=1,2,...n-1$ $$ D(i,i+1) = -1 $$ and the rest of the values of the inverse of $D$ are zero. Example (using $n=5$) $$ D^{-1} = \begin{bmatrix} 1 & 0 & 0 & 0 & 0 \\ -1 & 1 & 0 & 0 & 0\\ 0 &...


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