sensitivity]

The sensitivity of $𝑓$ at $𝑥$ is defined as the number of pivotal coordinates of a given input $𝑥$ for function $𝑓$ ; i.e.,

{sens}_{𝑓} (𝑥) = # {𝑖 \in [𝑛] : 𝑓 (𝑥) \neq 𝑓 (𝑥^{\oplus 𝑖})}