\(\begin{align} b &= \text{bottom}\\ t &= \text{top} \end{align}\)

Normal

\(\text{normal}(b,t) = t\)

Add

\(\text{add}(b,t) = \text{clamp}(b+t)\)

Subtract

\(\text{sub}(b,t) = \text{clamp}(b-t)\)

Difference

\(\text{diff}(b,t) = \max(b-t,t-b)\)

Multiply

\(\text{mul}(b,t) = bt\)