Update README.md

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

Author: FabianaCampanari

README.md

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 ## Predecessors of Quantum Mechanics
 
-### Leonhard Euler (1748) <br>
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+1. Leonhard Euler (1748) <br>
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 Leonhard Euler, one of the most significant mathematicians in history, contributed foundational mathematical principles that would later support the development of quantum mechanics. His work in functions and complex numbers laid the groundwork for modern physics.