pour utiliser les Sommes d'Euler, il faut bien entendu que k=0 ou k=1 (si k=2 cela coince mais on peut se débrouiller).Exemple de simplification : dans ce cas précis les 1 s'annulent (on peut s'en apercevoir en posant simplement les sommes ce qui permet d'utiliser Euler)
#Sommes doubles #Somme sur un rectangle #2 propriétés équivalentes : si l'une coince , on peut toujours essayer l'autre
#Somme sur un triangle #2 propriétés équivalentes : si l'une coince , on peut toujours essayer l'autre
#Source : Hans Amble (3 vidéos pour bien se former aux concepts des sommes rectangulaires et triangulaires)
#Source : Hans Amble
#Source : Hans Amble
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