The following is an argument stated in plain English. Symbolize it with the standardconnectives &, v, ~,⊃, parentheses (, ), and exactly three atomic sentences. You do not really know that you have a hand. Here is why. Imagine the possibility inwhich you are only a handless brain floating in a vat, wired to a super computer thatsends to your brain signals that perfectly simulate ordinary sensory experiences. Now, ifyou really know that you have a hand, you must be in a position to know that you arenot such a handless brain in a vat. But are you in a position to know that? No, becauseit is impossible for you to tell whether you are an ordinary person or such a handlessbrain in a vat. So you do not really know that you have a hand.