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The Banach-Tarski Paradox


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The Banach-Tarski Paradox is a concept in mathematics that deals with the strange and counterintuitive properties of infinite sets. It's named after the two mathematicians, Stefan Banach and Alfred Tarski, who discovered it in 1924. In simple terms, the Banach-Tarski Paradox states that it's possible to take a solid sphere, cut it into a small number of pieces, and then reassemble those pieces to form two identical copies of the original sphere, each with the same volume as the original.

To understand this concept, imagine you have a solid sphere like a basketball. According to the Banach-Tarski Paradox, you could, in theory, cut it into a certain number of oddly shaped pieces and then put them back together in a different arrangement to create not one, but two basketballs. And these two basketballs would be exactly the same size as the original one, which seems impossible to our everyday experiences.
It's important to note that this paradox works only in the realm of theoretical mathematics and not in the physical world. It's based on the concept of "infinite sets" of points within the sphere. In reality, objects like a basketball are made up of a finite number of atoms, so the paradox doesn't apply to them. But in the world of mathematical abstractions, the paradox leads to some intriguing questions about the nature of space and infinity.
This paradox has significant implications for our understanding of the concept of "volume" and raises questions about the very foundations of geometry and measure theory. However, despite its paradoxical nature, the Banach-Tarski Paradox is considered to be a valid mathematical result, consistent with the standard rules of mathematics.
In conclusion, the Banach-Tarski Paradox is a fascinating and mind-bending concept that challenges our intuition about space, geometry, and volume. By exploring the infinite sets and seemingly impossible rearrangements of points, this paradox opens up new avenues for understanding the more abstract and complex aspects of mathematics.

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TIL: ELI5By TIL