Update README.md

Signed-off-by: Fabiana 🚀  Campanari <[email protected]>

Author: FabianaCampanari

README.md

@@ -147,7 +147,7 @@ Joseph Fourier’s development of Fourier analysis allowed quantum mechanics to
    [Where]():  
    - $\large \color{DeepSkyBlue} f(x)$ is the original function in the spatial domain.  
    - $\large \color{DeepSkyBlue} \hat{f}(k)$ is the transformed function in the frequency domain.  
-   - $\large \color{DeepSkyBlue} \( x \)$ represents position, and $k$ represents momentum or frequency.
+   - $\large \color{DeepSkyBlue} \( x \)$ represents position, and $\large \color{DeepSkyBlue} k$ represents momentum or frequency.