Final answer:
Antisets are a mathematical concept potentially applicable in neo-mechanist causal set theory, which deals with quantum gravity by modeling spacetime as composed of discrete, causally ordered events.
Step-by-step explanation:
The concept of antisets can be quite abstract and seems to relate to the area of mathematical foundations or logic rather than classical physics directly. However, when we discuss neo-mechanist causal set theory, we are likely referring to a framework that could possibly incorporate advanced mathematical concepts within the realm of quantum mechanics or quantum gravity theories. Causal set theory is an approach to quantum gravity that postulates that spacetime is composed of discrete events, ordered by causality. While antisets are not commonly mentioned in standard physics discussions, the speculation could be that they might be used to represent anti-causal or non-ordinary causal relations in such a neo-mechanistic framework.