which on homogeneously graded elements aa of degree deg(a)∈{even,odd}=ℤ/2ℤdeg(a) \in \{even,odd\} = \mathbb{Z}/2\mathbb{Z} is multiplication by the degree
Dhibaatooyinka Xisbiyada Casriga ay Leeyihiin {Qaybta 1aad} - Fadhigii 2aad {Sheekh C/llaahi Barbaraawi}