Update README.md

README.md

@@ -50,13 +50,15 @@ Rayleigh-Bénard convection involves fluid dynamics and thermodynamics, seen in
 **Equation**:
 
 While we solve equations in the frequency domain, the original time-domain problem is
-```math
+
+$$
 \begin{align*}
 \frac{\partial b}{\partial t} - \kappa\,\Delta b & = -u\nabla b\,,
 \\
 \frac{\partial u}{\partial t} - \nu\,\Delta u + \nabla p - b \vec{e}_z & = -u \nabla u\,,
 \end{align*}
-```
+$$
+
 where \\(\Delta = \nabla \cdot \nabla\\) is the spatial Laplacian, \\(b\\) is the buoyancy, \\(u = (u_x,u_y)\\) the (horizontal and vertical) velocity, and \\(p\\) is the pressure, \\(\vec{e}_z\\) is the unit vector in the vertical direction, with the additional constraints \\(\int p = 0\\) (pressure gauge).
 
 The boundary conditions vertically are as follows: