3-NIRVANA-user-guide/3.2-User-interfaces.md

@@ -971,25 +971,15 @@ integral form of $\mathbf{B}=\nabla\times \mathbf{A}$:
 
 `g->bz[iz][iy][ix]` = \[*Δ*<sub>ix</sub>(*h*<sub>*y*</sub>*Â*<sub>*y*</sub>)−*Δ*<sub>iy</sub>*Â*<sub>*x*</sub>\]/*δ*𝒜<sub>*z*</sub>
 
-`g->bx[iz][iy][ix]`$=\left[h_y\Delta_{iy} (h_{zy}\hat{A}_z)
--h_y\Delta_{iz} \hat{A}_y\right]/\delta \mathcal{A}_x$
+where the difference operators *Δ*<sub>ix</sub>, *Δ*<sub>iy</sub> 
+and *Δ*<sub>iz</sub> are given by
 
-`g->by[iz][iy][ix]`$=\left[\Delta_{iz} \hat{A}_x
--h_{zy}\Delta_{ix} (h_y\hat{A}_z)\right]/\delta \mathcal{A}_y$
+*Δ*<sub>ix</sub>X=X(iz,iy,ix+1)-X(iz,iy,ix)
 
-`g->bz[iz][iy][ix]`$=\left[\Delta_{ix} (h_y\hat{A}_y)
--\Delta_{iy} \hat{A}_x\right]/\delta \mathcal{A}_z$
+*Δ*<sub>iy</sub>X=X(iz,iy+1,ix)-X(iz,iy,ix)
 
-where the difference operators $\Delta_{ix}$, $\Delta_{iy}$ and
-$\Delta_{iz}$ are given by
+*Δ*<sub>iz</sub>X=X(iz,iy,ix+1)-X(iz,iy,ix)
 
-$\Delta_{ix}X=X(\mathtt{iz,iy,ix+1})-X(\mathtt{iz,iy,ix})$,
-
-$\Delta_{iy}X=X(\mathtt{iz,iy+1,ix})-X(\mathtt{iz,iy,ix})$,
-
-$\Delta_{iz}X=X(\mathtt{iz,iy,ix+1})-X(\mathtt{iz,iy,ix})$
-
-and $(\hat{A}_x,\hat{A}_y,\hat{A}_z)$ are the cell-edge integrals
 and (*Â*<sub>*x*</sub>, *Â*<sub>*y*</sub>, *Â*<sub>*z*</sub>) 
 are the cell-edge integrals