Tom's Dec 26 edits

Author: tom-fredricksonDM

lectures/lu_tricks.md

@@ -236,7 +236,7 @@ Differentiating {eq}`oneone` with respect to $y_t$ for $t = N-m + 1, \ldots, N$
   \beta^{N-1} \left(a_{N-1}-hy_{N-1}-\Bigl(d_0 + \beta \, d_1\,
 L^{-1}\Bigr)\, d(L)\, y_{N-1}\right)
 & = 0 \cr
- \vdots & \vdots\cr
+\vdots \quad \quad \quad \vdots \quad \quad & = 0 \cr
 \beta^{N-m+1} \biggl(a_{N-m+1} - h y_{N-m+1} -(d_0+\beta L^{-1}
 d_1+\cdots\  +\beta^{m-1} L^{-m+1} d_{m-1}) d(L) y_{N-m+1}\biggr)
 & = 0