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 #### I. [Predecessors of Quantum Mechanics](#predecessors-of-quantum-mechanics) – Key Mathematicians and Their Contributions
-1. **Leonhard Euler (1748)**  
+1. [**Leonhard Euler (1748)**](#leonhard-euler-1748)  
 2. **Carl Friedrich Gauss (1809)**  
 3. **Joseph Fourier (1822)**  
 4. **Srinivasa Ramanujan (1910–1920)**