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