Forward box plus
From timescalewiki
Let $\mathbb{T}$ be a time scale. We define the (forward) boxplus operation $\boxplus_{\mu}$ by $$\left( p \boxplus_{\mu} q \right)(t) := p(t)+q(t)+\dfrac{p(t)q(t)\mu(t)}{t},$$ where $\mu$ denotes the forward graininess.
See also
Forward boxminus
Gamma function