 \( Z(h,e\mid k)= \begin{cases} \dfrac{P(h\mid e \wedge k) - P(h\mid k)}{1-P(h\mid k)} &amp; \mbox{if } P(h\mid e \wedge k) \ge P(h\mid k) \\ \\ \dfrac{P(h\mid e \wedge k) - P(h\mid k)}{P(h\mid k)} &amp; \mbox{if } P(h\mid e \wedge k) \lt P(h\mid k) \end{cases} \) 