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topology

Tracked in 26 AFBytes stories. First seen May 28, 2026. Last seen Jun 02, 2026.

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What is "x" in this definition of a basis?

In this definition, what is ##x## in the property (ii)? Did they mean, "(ii) For any open ##V \subset X## and any ##x \in V##, there exists some ##U \in...

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What is "x" is this definition of a basis?

In this definition, what is ##x## in the property (ii)? Did they mean, "(ii) For any open ##V \subset X## and any ##x \in V##, there exists some ##U \in...

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Futility Closet

How many distinct knots have exactly 10 crossings? By the late 20th century, mathematicians believed the number to be 166. Then, in 1973, New York attorney and ...

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