Double filtrators (new book section)

I’ve added a new section “Double filtrators” to the book “Algebraic General Topology. Volume 1”.

I show that it’s possible to describe (\mathsf{FCD}), (\mathsf{RLD})_{\mathrm{out}}, and (\mathsf{RLD})_{\mathrm{in}} entirely in terms of filtrators (order). This seems not to lead to really interesting results but it’s curious.

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