One distinct difference between axioms of topology and sigma algebra is the asymmetry between union and intersection; meaning topology is closed under finite intersections sigma-algebra closed under countable union. It is very clear mathematically but is there a way to think; so that we can define a geometric difference? In other words I want to have an intuitive idea in application of this objects.
General Topology – Difference Between Topology and Sigma-Algebra Axioms
general-topologymeasure-theorysoft-question
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Best Answer
I would like to mention that in An Epsilon of Room, remark 1.1.3, Tao states:
Later, in example 1.1.5: