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Update READMEs.
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@ -5,6 +5,10 @@ In set theory a Cartesian product is a mathematical operation that returns a set
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the Cartesian product A × B is the set of all ordered pairs (a, b)
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the Cartesian product A × B is the set of all ordered pairs (a, b)
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where a ∈ A and b ∈ B.
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where a ∈ A and b ∈ B.
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Cartesian product `AxB` of two sets `A={x,y,z}` and `B={1,2,3}`
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Image from [Wikipedia](https://en.wikipedia.org/wiki/Cartesian_product)
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## References
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[Wikipedia](https://en.wikipedia.org/wiki/Cartesian_product)
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