Update README.md

README.md

@@ -299,6 +299,6 @@ $$S = k_0 \cdot q \cdot \Phi \qquad L_a = k_0 \cdot q \cdot \Phi$$
 
 The product of charge × magnetic flux has the dimensions of an **action** and of an **angular momentum**: [C]·[Wb] = [J·s]. This isn't a coincidence — it's the backbone of three chapters of quantum physics:
 
-- <span>$q\Phi/\hbar$</span> est une phase → l'**effet Aharonov–Bohm** ;
+$$q\Phi/\hbar$$ est une phase → l'**effet Aharonov–Bohm** ;
 - <span>$L_a = q\Phi$</span> : le champ électromagnétique...
 - <span>$q\Phi = n\hbar$</span> → la **quantification du flux**...