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scratchpad4

-              v4
+              v5
 and then work out the coefficients for the matrix equation
 $\alpha_0 = -A -2E_{jj}T_0^\lambda = n \kappa_\parallel \psi$
+$\alpha_0 = -\frac{1}{\Delta t} -2\frac{E_{jj}}{2 \Delta x}T_0^\lambda$
 $\alpha_{\pm j} = \pm C_jT^\lambda_{\pm \hat{j}} + E_{jj}T_{\pm \hat{j}}^\lambda$
+$\alpha_{\pm j} = \pm C_jT^\lambda_{\pm \hat{j}} + \frac{E_{jj}}{\Delta x^2}T_{\pm \hat{j}}^\lambda$
+$\alpha_{\pm i \pm j} = \pm \pm \frac{E_{ij}}{4 \Delta x^2}T^\lambda_{\pm \hat{i} \pm \hat{j}}$