Fix documentation syntax, enable MATHJAX

doc/Doxyfile.in

@@ -1428,7 +1428,7 @@ FORMULA_TRANSPARENT    = YES
 # The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-USE_MATHJAX            = NO
+USE_MATHJAX            = YES
 
 # When MathJax is enabled you can set the default output format to be used for
 # the MathJax output. See the MathJax site (see:

src/adiabatic_index.h

@@ -54,7 +54,7 @@
 /**
  * @brief Returns the argument to the power given by the adiabatic index
  *
- * Computes $x^\gamma$.
+ * Computes \f$x^\gamma\f$.
  */
 __attribute__((always_inline)) INLINE static float pow_gamma(float x) {
 
@@ -86,7 +86,7 @@ __attribute__((always_inline)) INLINE static float pow_gamma(float x) {
  * @brief Returns the argument to the power given by the adiabatic index minus
  * one
  *
- * Computes $x^(\gamma - 1)$.
+ * Computes \f$x^{(\gamma-1)}\f$.
  */
 __attribute__((always_inline)) INLINE static float pow_gamma_minus_one(
     float x) {
@@ -115,7 +115,7 @@ __attribute__((always_inline)) INLINE static float pow_gamma_minus_one(
  * @brief Returns one over the argument to the power given by the adiabatic
  * index minus one
  *
- * Computes $x^{-(\gamma - 1)}$.
+ * Computes \f$x^{-(\gamma-1)}\f$.
  */
 __attribute__((always_inline)) INLINE static float pow_minus_gamma_minus_one(
     float x) {