“And at last we've got to the end of this ideal racecourse! Now that you accept A and B and C and D, of course you accept Z."
"Do I?" said the Tortoise innocently. "Let's make that quite clear. I accept A and B and C and D. Suppose I still refused to accept Z?"
"Then Logic would take you by the throat, and force you to do it!" Achilles triumphantly replied. "Logic would tell you, 'You can't help yourself. Now that you've accepted A and B and C and D, you must accept Z!' So you've no choice, you see."
"Whatever Logic is good enough to tell me is worth writing down," said the Tortoise. "So enter it in your notebook, please. We will call it
(E) If A and B and C and D are true, Z must be true.
Until I've granted that, of course I needn't grant Z. So it's quite a necessary step, you see?”

— Lewis Carroll , book What the Tortoise Said to Achilles

"I see," said Achilles; and there was a touch of sadness in his tone.
"What the Tortoise Said to Achilles", Mind, n.s., 4 (1895), pp. 278–80

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Lewis Carroll 241

English writer, logician, Anglican deacon and photographer 1832–1898

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