disputed by prominent interpretations of quantum mechanics, and while not necessarily representative of intrinsic indeterminism in nature, fundamental limits of precision in measurement are inherent in the uncertainty principle. The relevance of such prospective indeterminate activity to free will is, however, contested, even when chaos theory is introduced to magnify the effects of such microscopic events. Below these positions are examined in more detail. Hard determinism Determinism can be divided into causal, logical and theological determinism. Corresponding to each of these different meanings, there arises a different problem for free will. Hard determinism is the claim that determinism is true, and that it is incompatible with free will, so free will does not exist. Although hard determinism generally refers to nomological determinism (see causal determinism below), it can include all forms of determinism that necessitate the future in its entirety. Relevant forms of determinism include: Causal determinism The idea that everything is caused by prior conditions, making it impossible for anything else to happen. In its most common form, nomological (or scientific) determinism, future events are necessitated by past and present events combined with the laws of nature. Such determinism is sometimes illustrated by the thought experiment of Laplace's demon. Imagine an entity that knows all facts about the past and the present, and knows all natural laws that govern the universe. If the laws of nature were determinate, then such an entity would be able to use this knowledge to foresee the future, down to the smallest detail. Logical determinism The notion that all propositions, whether about the past, present or future, are either true or false. The problem of free will, in this context, is the problem of how choices can be free, given that what one does in the future is already determined as true or false in the present. Theological determinism The idea that the future is already determined, either by a creator deity decreeing or knowing its outcome in advance. The problem of free will, in this context, is the problem of how our actions can be free if there is a being who has determined them for us in advance, or if they are already set in time. Other forms of determinism are more relevant to compatibilism, such as biological determinism, the idea that all behaviors, beliefs, and desires are fixed by our genetic endowment and our biochemical makeup, the latter of which is