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La nullité de Jones<br />
Définition (nullité de Jones)<br />
On pose null V (L) := max{ ν ∈ N | V (L) = (q + + q − ) ν · Ṽ (L) }<br />
Remarque<br />
Puisque V (○ n ) = (q + + q − ) n−1 on a V (○ n ) = n − 1.<br />
Puisque V (L)| (q↦→1) = 2 n−1 on a 0 ≤ null V (L) ≤ n − 1.