Primary sourceBook1895
What the Tortoise Said to Achilles
Lewis Carroll · 1895
A short philosophical dialogue by Lewis Carroll, published in the journal Mind in 1895, exploring a paradox about logical inference.
Carroll wrote this dialogue under his own name, showing his serious work as a logician alongside his famous fiction.
About this source
What it is
This brief allegorical dialogue was written by Lewis Carroll in 1895 for the philosophical journal Mind. It imagines a conversation between Achilles and a tortoise, referencing one of Zeno's paradoxes, in which the tortoise leads Achilles into an endless chain of reasoning while trying to force him to accept a simple logical conclusion.
Why it matters
The piece shows Carroll's serious side as a mathematician and logician, separate from his famous nonsense stories. It raises a genuine problem in the foundations of logic, the puzzle of justifying basic rules of inference, that philosophers including Bertrand Russell later discussed, and it remains debated by logicians today.
Look closer
- Why does the tortoise keep refusing to accept Achilles' conclusion?
- What does this dialogue suggest about the limits of logical proof?
- Why might Carroll have chosen a playful story format to explore such a serious philosophical problem?
This book is part of the curated material that grounds the AI version of Lewis Carroll on Humy.ai — when students ask about related events, the AI can quote it and cite it.
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