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A bottleneck is defined as a subset S of the left-side vertices whose neighborhood on the right side is strictly smaller than S itself. Mathematically, S is a bottleneck if and only if |S| > |$E(S)$|.

Conditions: S is a subset of the left-side vertices.; $E(S)$ is the neighborhood of S in the right-side set.

A bottleneck is defined as a subset S of the left-side vertices whose neighborhood on the right side is strictly smaller than S itself. Mathematically, S is a bottleneck if and only if |S| > |$E(S)$|.

Conditions: S is a subset of the left-side vertices.; $E(S)$ is the neighborhood of S in the right-side set.