Do Numbers Exist?: A Debate about Abstract Objects - Paperbackby Peter Van Inwagen (Author), William Lane Craig (Author) In Do Numbers Exist? Peter van Inwagen and William Lane Craig take opposite sides on whether there are abstract objects, such as numbers and properties. Craig argues that there are no abstract objects, whereas Van Inwagen argues that there are. Their exchange explores various arguments about the existence and nature of abstract objects. They focus especially on whether our ordinary and