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20 17 Mathematical Geometry of College Entrance Examination
Enclose several numbers in braces, and separate two adjacent numbers with commas, such as {1, 2}, {1, 4,7}, etc. We call it assembly.

Enclose several numbers in braces, and separate two adjacent numbers with commas, such as {5}, {2,3}, {4,9, 10}, which we call a set, where each number is called an element of the set, such as {4,9, 10} with elements of 4,9 respectively. X must also be an element of this set, which we also call the golden set.

For example, {0,20 17}, 2017? 0=20 17,20 17? 20 17=0, and the two elements in the set, 0 and 20 17, both meet the definition of a golden set, so it is a golden set.

The golden section set refers to a special mathematical set, also known as the golden section set or the golden ratio set. It is a geometric structure defined by the golden ratio.

The golden section ratio, also known as the golden section, refers to dividing a line segment into two parts, so that the ratio of the longer part to the whole line segment is equal to the ratio of the shorter part to the longer part. The ratio is about 1.6 18.

The golden set is a series of squares obtained by constantly constructing and translating the golden section ratio in space. The concrete construction method is: starting from a unit square, add a new square to the right of the original square, which is in golden proportion to the original square. Then add a new square to the right of the new square, which is in golden proportion to the growth of the new square edge. Repeat this process infinitely, and you get the gold collection.

The golden collection has many aesthetic features and wonderful mathematical properties. It is often used in the fields of architecture, art and design, and is considered to have a sense of aesthetic harmony.

The Mathematical Meaning of Braces

In mathematics, braces usually represent sets. A collection is an object composed of a set of different elements. Elements are separated by commas in braces, indicating that they belong to the same collection.