Assume that the invertible sheaf $L$ is ample, then the following conditions are equivalent.

1. (a)

   $\lambda_{h}(l)=0$,

2. (b)

   for any $\epsilon>0$, there exists $n\in\mathbb{N}_{\geq 1}$ and a section $s\in H^{0}(X,L^{\otimes n})$ such that ${\left.{s}\right|_{{Y}}}=l^{n}$ and that $\|s\|_{h}\leq e^{\epsilon n}\|l\|_{Y,h}$.