- Walla Walla, Washington (Wikipedia)
Walla Walla is a city in Walla Walla County, Washington, where it is the largest city and county seat. It had a population of 34,060 at the 2020 census, estimated to have decreased to 33,927 as of 2021. The population of the city and its two suburbs, the town of College Place and unincorporated Walla Walla East, is about 45,000.
- Sierpiński triangle (Wikipedia)
The Sierpiński triangle, also called the Sierpiński gasket or Sierpiński sieve, is a fractal with the overall shape of an equilateral triangle, subdivided recursively into smaller equilateral triangles. Originally constructed as a curve, this is one of the basic examples of self-similar sets—that is, it is a mathematically generated pattern that is reproducible at any magnification or reduction. It is named after the Polish mathematician Wacław Sierpiński, but appeared as a decorative pattern many centuries before the work of Sierpiński.
