Abstract

A contrary-to-duty obligation is an obligation that tells us what ought to be the case if something that is wrong or forbidden is true. Alternatively, we might say that a contrary-to-duty obligation is a conditional obligation where the condition is fulfilled only if a primary obligation is violated. Consider this example: “If you have hurt her feelings, you should make amends.” Since contrary-to-duty obligations play an important role in our moral and legal thinking, we want to find a good analysis of this concept. However, it has turned out to be difficult to formalize various contrary-to-duty obligations. This is illustrated by the so-called contrary-to-duty paradox. This paradox is generated when we try to symbolize various scenarios that include at least one contrary-to-duty obligation in many formal deontic systems, such as Standard Deontic Logic. Such symbolizations are often inconsistent or entail some other problematic consequences. This entry is a brief introduction to this problem.