Measure Theory (subject)
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Overview
Measure theory seeks to make the notion of measuring things formal. For example, given a ruler, you can add two lengths, you can subtract lengths, so given a set where you can do these things (subtract and add  set subtraction and union respectively) you expect to be able to define a measure, such a system of sets is called a ring of sets (not to be confused with ring a totally different and unrelated concept)
Statistics
The measure theory project contains:
 Definitions  106 pages
 Theorems, lemmas and corollaries  39 pages
 (all pages)  147 pages
