diff --git a/README.md b/README.md
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+++ b/README.md
@@ -50,7 +50,6 @@ Feel free to explore, contribute, and share your insights!
    - $\large \color{DeepSkyBlue} h$ is Planck's constant ($6.626 \times 10^{-34} \, \text{J·s}$).  
    - $\large \color{DeepSkyBlue} f$ is the radiation frequency.
 
-
 #
   
 2. **Albert Einstein (1905)**  
@@ -63,8 +62,31 @@ Feel free to explore, contribute, and share your insights!
    - $\large \color{DeepSkyBlue} W$ is the work function (minimum energy required to remove an electron).  
    - $\large \color{DeepSkyBlue} K$ is the kinetic energy of the ejected electron.
 
+#
+
+3. **Niels Bohr (1913)**  
+   * Bohr's atomic model with quantized energy levels.
+
+   Formula for the energy levels of the electron in the hydrogen atom:  
+   $\huge \color{DeepSkyBlue} E_n = -\frac{13.6 \, \text{eV}}{n^2}$
+
+   Where:  
+   - $\large \color{DeepSkyBlue} E_n$ is the energy of level $n$.  
+   - $\large \color{DeepSkyBlue} n$ is the principal quantum number.
+  
+
+#   
 
+4. **Erwin Schrödinger (1926)**  
+   * Schrödinger's equation, the foundation of wave mechanics.
 
+   Time-dependent form of Schrödinger's equation:  
+   $\huge \color{DeepSkyBlue} i\hbar \frac{\partial}{\partial t} \psi(r, t) = \hat{H} \psi(r, t)$  
+
+   Where:  
+   - $\large \color{DeepSkyBlue} \psi(r, t)$ is the wave function of the system.  
+   - $\large \color{DeepSkyBlue} \hat{H}$ is the Hamiltonian operator.  
+   - $\large \color{DeepSkyBlue} \hbar$ is the reduced Planck constant.