Real-derivatives.md

@@ -3,7 +3,7 @@
 ```c
 int wderiv_derivative_3d_r(int direction, int n, double *f, double *deriv)
 ```
-Function computes n-th derivative with respect to `direction` of 3D real function $`f(x,y,z)`$: $`\frac{\partial^n f}{\partial t^n}`$.
+Function computes `n`-th derivative with respect to `direction` of 3D real function $`f(x,y,z)`$: $`\frac{\partial^n f}{\partial t^n}`$.
  * `direction` - predefined integer corresponding to direction of derivative: `WDERIV_DX` or `WDERIV_DY` or `WDERIV_DZ`
  * `f` - pointer to input function which is array of size [nx\*ny\*nz]
  * `deriv` - pointer to output derivative function which is array of size [nx\*ny\*nz]