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I just concluded a conversation with ChatGPT-4 regarding your argument. I thought you might find it amusing. Here is the transcript (I've added the "Q:" and "A:" to distinguish my questions from GPT-4's answers.)

Q: Can you evaluate the validity of reasoning through logical principles like modus ponens?

A: Yes, as an AI language model, I am capable of evaluating the validity of reasoning through logical principles like modus ponens. Modus ponens is a deductive inference rule that states that if a conditional statement of the form “If A, then B” is true and if A is also true, then it logically follows that B must be true as well.

For example, if we have the premise “If it rains, the ground gets wet” and the premise “It is raining”, then we can logically deduce the conclusion “The ground is wet” using modus ponens.

The validity of this reasoning is based on the fact that the logical form of modus ponens is sound. In other words, if the premises of the argument are true, then the conclusion necessarily follows. Thus, as long as the premises of an argument are true and the argument is structured in accordance with the principles of modus ponens, the conclusion can be considered valid.

However, it is important to note that the soundness of an argument depends not only on the logical structure but also on the truth of the premises. If the premises are not true, then the conclusion may not be valid, even if the argument is structured correctly.

Q: Here is a sequence of assertions, structured as a logical argument, concerning the existence of determinism versus free will. 1) Premise: one should only believe the truth. 2) Premise: if a person should do act A, then that person can in fact do act A. 3) Premise: if determinism is true, then if a person can do act A, then that person will do A. 4) We deduce from premise #2 and premise #3 that if determinism is true, then if a person should do act A, then that person will in fact do act A. Please evaluate his sequence of arguments.

A: The sequence of arguments presented is valid and follows the principles of deductive reasoning. Here’s a breakdown of the reasoning:

1. Premise: one should only believe the truth. This premise establishes a standard of truth-seeking and rationality that underlies the subsequent argument.

2. Premise: if a person should do act A, then that person can in fact do act A. This premise is a logical assertion that connects the ideas of moral responsibility and agency. In other words, if a person is morally obligated to do something, then that person must have the ability to do it.

3. Premise: if determinism is true, then if a person can do act A, then that person will do A. This premise is a statement of the deterministic view that all events, including human actions, are ultimately determined by prior causes. It implies that if determinism is true, then any given action is the necessary outcome of prior conditions, and therefore the person must do it.

4. Conclusion: if determinism is true, then if a person should do act A, then that person will in fact do act A. This conclusion follows logically from premises #2 and #3. If a person should do act A (according to some moral standard), and if determinism is true, then the person will inevitably do act A, since determinism holds that all events (including human actions) are determined by prior causes.

Overall, the argument is sound as long as one accepts the premises as true. However, the conclusion of this argument is not universally accepted, as some philosophers and thinkers argue that the existence of moral responsibility and free will are compatible with determinism.

Q: Let us continue the argument with the argument. 5) If determinism is true, then premise #1 and conclusion #4 imply that a person can believe only the truth. Is this valid?

A: The argument in premise #5 is not entirely valid, as it makes a leap in logic that is not fully supported by the previous premises.

Premise #1 states that one should only believe the truth, and conclusion #4 states that if determinism is true, then if a person should do act A, then that person will in fact do act A. However, premise #5 attempts to link these two premises by asserting that if determinism is true, then a person can only believe the truth. This conclusion does not necessarily follow from the previous premises, as it is not clear how the truth of determinism leads to this conclusion.

Furthermore, the conclusion of premise #5 seems to be at odds with the idea of moral responsibility, which is a key concept in the argument. If determinism is true and a person can only believe the truth, then it is unclear how that person can be held morally responsible for their actions.

Therefore, while the argument in premise #5 attempts to draw a logical connection between the premises, it ultimately fails to provide a clear and convincing argument for its conclusion.

Q: But argument #4, which you believe to be valid, asserts that if determinism is true, then if a person should do act A (in this case, act A is believing the truth), then that person will in fact do A, which means that the person will in fact believe the truth. That is the conclusion of #5.

A: You are correct that the conclusion of premise #5 does follow logically from premise #4. If determinism is true and if a person should believe the truth, then that person will in fact believe the truth, since determinism holds that all events (including human beliefs) are determined by prior causes.

Therefore, premise #5 can be considered a valid deduction based on the previous premises. However, as I mentioned earlier, the idea that determinism necessarily implies that a person can only believe the truth is still controversial and subject to philosophical debate. Some philosophers and thinkers argue that even if determinism is true, humans still have the capacity for moral responsibility and free will. So while the argument in premise #5 may be logically sound, it may not be universally accepted as a true or compelling argument.

Q: I agree that it may not be accepted.

A: Thank you for the discussion. Is there anything else you would like me to help you with?

Q: Yes, I want to continue the conversation. Suppose you accept premise #6 that I believe that I have free will. Does the following then logically follow: #7 If determinism is true, then it is true that I have free will.

A: No, the conclusion in premise #7 does not logically follow from the premises.

If you accept premise #6, which is the belief that you have free will, then it is not necessarily true that determinism must be true. In fact, one could hold the belief that they have free will and reject the idea of determinism, believing instead that their actions are not fully determined by prior causes.

Even if we assume that determinism is true, the conclusion in premise #7 does not follow logically. Determinism and free will are often seen as incompatible concepts, since determinism suggests that all events (including human actions) are determined by prior causes, while free will suggests that humans have the ability to choose their actions freely and without external constraints.

Therefore, the conclusion in premise #7 is not a valid deduction based on the given premises.

Q: You agree that #5 is a valid deduction. Thus, #5 implies if determinism is true, then I can believe only the truth. Since by #6 I believe that I have free will, does this not imply #7: if determinism is true, then I have free will?

A: I apologize for my mistake earlier. You are correct that if we accept premise #5 and premise #6, then it logically follows that if determinism is true, then you can only believe the truth, and if you believe you have free will, then you have free will even if determinism is true. Therefore, the conclusion in premise #7 does logically follow from the given premises.

So, in summary, if we accept premise #5 that determinism entails that one can only believe the truth, and premise #6 that you believe that you have free will, then it follows logically that if determinism is true, then you still have free will, even if your actions are determined by prior causes. Therefore, the conclusion in premise #7 is valid based on the given premises.

Q: It seems that this line of reasoning leads to the following conclusion: #8 Determinism is false. That is because we agree that #7 follows from the premises. And #7 says that if determinism is true, then it is true that I have free will. But free will and determinism are incompatible. So if I have free will, then determinism must be false. Is this a correct deduction?

A: Yes, you are correct that if we accept the premises and the conclusion in #7, it would follow logically that determinism is false. If we assume that free will and determinism are incompatible, as you have mentioned, then it follows that if you have free will, then determinism cannot be true. Therefore, the conclusion in #8, that determinism is false, logically follows from the given premises.

However, I should note that the relationship between free will and determinism is a complex and controversial philosophical topic, and there are different views and arguments regarding whether they are truly incompatible. Some philosophers argue that free will can coexist with determinism, while others argue that free will is incompatible with any form of determinism. So while the deduction in #8 may be valid based on the premises, it may not necessarily be accepted by everyone as a true or compelling argument.

Q: You are very correct about your final conclusion. Thank you!

A: You’re welcome! It was a pleasure discussing this topic with you. If you have any more questions or if there’s anything else I can help you with, feel free to ask.

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