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Which Alice?

Which Alice?

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ALICE IN PUZZLE-LAND<br />

awake, then it is not true that they are either both asleep or<br />

both awake. This means that one of them is asleep and the other is<br />

awake. The one who's sleeping he believes is awake, and the one<br />

who's awake he believes is asleep.<br />

7—Since his belief is wrong, then in fact the Lion must be in the<br />

forest without the Unicorn. Therefore the Lion is in the forest. So<br />

he must believe that the Lion is not in the forest.<br />

8—Since his belief is false, then the Jabberwocky has never made<br />

any true statements in his life; all statements ever made by the<br />

Jabberwocky have been false. Therefore the Looking-Glass logician<br />

must believe every one of them!<br />

9—Since he believes that all gryphons have wings, then it is false<br />

that all gryphons have wings, which means there must be at least<br />

one gryphon without wings. Therefore there must be at least one<br />

gryphon.<br />

10—This is a trick question, because it is not possible that a<br />

Looking-Glass logician can believe both these facts!<br />

Suppose he believes that <strong>Alice</strong> won't reach the eighth square<br />

without becoming a queen. Then it is false that <strong>Alice</strong> won't reach<br />

the eighth square without becoming a queen, which means that<br />

<strong>Alice</strong> will reach the eighth square without becoming a queen. Hence<br />

it is true that <strong>Alice</strong> will reach the eighth square, so it is impossible<br />

that the Looking-Glass logician can believe that she will.<br />

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