For example: "If you do not pay me $30 I will break your leg. Therefore you owe me $30." It is fallacious because no amount of force can change the truth or falsity of the initial proposition.
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For example: "If you do not pay me $30 I will break your leg. Therefore you owe me $30." Another example: "Might makes right." Or, the threat of persecution, rebellion, revolt or war.
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This appeal is fallacious because no amount of force can change the truth or falsity of the initial proposition.