3.2 Quelques propriétés
1in
(x i + y i ) =
1in
x i +
1in
y i ;
1in
(kx i ) = k
1in
x i ;
1in
(x i y i ) =
1in
x i ×
1in
y i ;
1in
(kx i ) = k
n
1in
x i ;
1in
1 j p
x i j =
1in
1 j p
x i j
=
1 j p
1in
x i j
Entiers naturels
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