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 ## Table of Contents
 
-### [Predecessors of Quantum Mechanics](#predecessors-of-quantum-mechanics) – Key Mathematicians and Their Contributions
+#### [Predecessors of Quantum Mechanics](#predecessors-of-quantum-mechanics) – Key Mathematicians and Their Contributions
 1. **Leonhard Euler (1748)**  
 2. **Carl Friedrich Gauss (1809)**  
 3. **Joseph Fourier (1822)**