Peter Van Inwagen's Argument Analysis

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In “The Incompatibility of Free Will and Determinism”, Peter Van Inwagen argues that free will is incompatible with determinism. It is understood that free will is one’s ability to act otherwise than he actually does. Inwagen states that for every instant of time, there exists a proposition, a set of descriptions of the state of the world, at that instant. Inwagen defines determinism such that a proposition at an instant, with conjunction of the law of physics, entails a proposition at another instant. Inwagen constructs his main argument to demonstrate that under the assumption of determinism being true, one has no such capability to act otherwise. He henceforth concludes the incompatibility of determinism and free will. In this essay, I will …show more content…

The biggest flaw I find in his argument is the inconsistent meaning of ‘render’ in regard to unchangeable facts in premise (4) and (5). If it is interpreted with consistency, the argument fails as certain premise and the conclusion no longer holds. First, I would like to establish that both P0, the past, and L, the laws of nature, are unchangeable facts to human beings. It follows that one cannot cause or prove true unchangeable facts to be false; one can only prove or discover the falsity of false suppositions of unchangeable facts. For example, it was widely accepted that the earth was flat until Eratosthenes proved it false. We could here say: Eratosthenes rendered it false that the earth was flat. He clearly did not cause the earth to be not flat, nor did he cause the true proposition of the earth being flat to be false. The earth had always been not flat in spite of Eratosthenes’ discovery. It simply means that he proved the falsity of a proposition that was falsely assumed all along. With Inwagen’s definition of ‘render’, I could accept (4) to mean that J could have proved that (P0&L) was not the actual conjunction that existed. It is obvious that the non-existence of (P0&L) is not caused by J’s action. Thus, (P0&L) had been false from time T0 independent of whether J raises his hand or not at T. Similarly, since L is also an unchangeable fact, then premise (5) means that J could have proved L false if he could have proved (P0&L) false. Again, (5) would imply that L had been false the whole time independent of J’s actions at T. If we acknowledge this consistency among (4) and (5), L or (P0&L) could have been false the whole time. Then it is entirely possible for J to render L false, as in to prove the falsity of L which was already false. Hence, (6) would then be false and so follows the conclusion. In order for (6) to be true, we will have to accept the following definitions: ‘render’ means to

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