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Comment on Data structures as topological spaces (2002) [pdf]

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So, the expression
1, 1+1, 2+1, ():set
builds the set with the three elements 1, 2 and 3

Regarding the "():set" part, and the "():something" idiom repeating in the article, is that from the same competition for the most absurd syntax where Golang got most of its awkwardness?

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