La structure différentielle de l'anneau des formes quasi-modulaires pour ${\bf SL}_2({\Bbb Z})$
Résumé
Let ${\mathcal Y}$ be the ring of quasi-modular forms for ${\bf SL}_2({\Bbb Z})$. We explicitely compute the set of all the prime ideals of ${\cal Y}$ which are stable by derivation.
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