Chapter 1.3, Problem 10E

For each of these compound propositions, use the conditional-disjunction equivalence (Example 3) to find an equivalent compound proposition that does not involve conditionals.

a) $\neg p\to \neg q$

b) $\left(p\vee q\right)\to \neg p$

c) $\left(p\to \neg q\right)\to \left(\neg p\to q\right)$