Students living in the north are no strangers to snowflakes, which have attracted the admiration of countless poets. But if you ask the shape of a snowflake, not many students can answer it. Some people may say that snowflakes are hexagonal, which is true, but not necessarily. What shape is the snowflake? 1904 The Swedish mathematician Koch described a method to describe snowflakes.

Firstly, draw an equilateral triangle, and select a small equilateral triangle whose side length is one third of the original triangle on three sides of the original triangle to get a hexagonal star; Then use the same method as above to turn the small equilateral triangle on each corner of the hexagonal star into a small hexagonal star ... and so on, you get the shape of snowflake.

As can be seen from the above description process, every part of the original snowflake, after amplification, can be exactly the same as its whole. A small snowflake has so much knowledge. At present, there is a mathematical discipline that specializes in snowflakes and other figures, that is, fractal geometry founded by American computer expert Mandel blauth in the 1970s. The so-called fractal geometry is to study the geometry of irregular curves. At present, fractal geometry has been applied in many fields.