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What are R (R), S (R) and T (R)?
The minimum reflexivity involving r.

According to the relevant information, in fact, R, S, T is the calculation theorem of the minimum reflexive relation including R 1. Given the relation R in A, then r(R=R∪IA.

R, S and T are the language and operating environment for statistical analysis and drawing. R is a free, free and open source software belonging to GNU system. It is an excellent tool for statistical calculation and statistical drawing.