Overview
Given a vector space {% V %}, a function
{% f: V \rightarrow \mathbb{R}%}
is sublinear if
{% f(x+y) \leq f(x) + f(y) %}
and
{% f(\lambda x) = \lambda f(x) %}
for {% \lambda \in \mathbb{R} %} and {% \lambda \geq 0 %}.