Rudin's proof of the principle of mathematical analysis (I) - Training Enrollment Network

Rudin's proof of the principle of mathematical analysis (I)

R is a family collection. A is contained in R, so A is also a family set.

A is an element in A, so A is also a set, and A belongs to A. ..

Gamma is the union of all elements (sets) in A, so all elements A in A are included in gamma.

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