fix math symbols issue

2025R2/system-coupling-2025-r2/articles/user-guide/multiregion.md

@@ -94,9 +94,9 @@ To get the average temperature on these two regions,
 the sum of temperature nodal values is divided by the number
 of unique nodes. In this example,
 the average temperature is
-\f$\f$
+$$
 (500 + 300 + 800 + 600 + 500 + 300) / 6 = 500 [K]
-\f$\f$.
+$$.
 
 ![Figure 6: Nodal intensive variable (temperature) values for the multi-region case with shared nodes](../images/MultiregionFigure6.png)
 *Figure 6: Nodal intensive variable (temperature) values for the multi-region case with shared nodes*

2025R2/system-coupling-2025-r2/articles/user-guide/pipe-mapping-tutorial.md

@@ -35,7 +35,7 @@ elements. The meshes with default settings are shown in _Figure 1_.
 _Figure 1: Default pipe meshes_
 
 On each side, we initialize the nodal
-solution data with a simple linear profile \f$f(x,y,z) = 1x + 2y + 3z + 4\f$. On the **quad** region, we initialize
+solution data with a simple linear profile $f(x,y,z) = 1x + 2y + 3z + 4$. On the **quad** region, we initialize
 **linear1** variable, and on the **tri** region, we initialize the **linear2** variable.
 
 We then use the mapping capabilities within the Participant Library to transfer

2025R2/system-coupling-2025-r2/articles/user-guide/plate-damping-tutorial.md

@@ -42,14 +42,14 @@ _Figure 1: Structural solver geometry_
 Since the purpose of this example is to demonstrate the use of Participant
 Library APIs for a transient analysis, a simple damping force solver will be
 used to couple with Mechanical via System Coupling. This solver receives nodal
-displacements \f$\vec{X}\f$ from Mechanical and calculates the damping force
-\f$\vec{F}\f$ using the following formula:
+displacements $\vec{X}$ from Mechanical and calculates the damping force
+$\vec{F}$ using the following formula:
 
-\f$\f$
+$$
 \vec{F} = - c \frac{d\vec{X}}{dt}
-\f$\f$
+$$
 
-where \f$c\f$ is the damping coefficient and \f$\frac{d\vec{X}}{dt}\f$ is the rate of change
+where $c$ is the damping coefficient and $\frac{d\vec{X}}{dt}$ is the rate of change
 of nodal positions with respect to time (nodal velocities).
 The damping solver will then provide the calculated
 forces to Mechanical via System Coupling, and these damping forces will cause the