Abstract:
In mathematics, not only objects (numbers, figures, sizes) are studied, but also the relationships between them. For example, the number 11 is greater than the number 9 (more); 7 is 2 more than 5; The number 5 comes after the number 2, more precisely, it is connected with "more", "more", "later" and so on. In geometry, the parallelism and perpendicularity of straight lines, the equality and similarity of figures, the comparison, intersection or equality of sets, etc. are studied.
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