On August 19, 2015 (July 6, 2015 in the lunar calendar), American mathematicians discovered a new seamless and densely paved planar pentagonal structure. August 19, 2015 According to foreign media reports, a research team at the University of Washington in the United States recently discovered a new irregular pentagon. When combined with each other, it can completely cover the plane without overlap or any gaps. It is the world's 15th pentagon that can achieve this effect. It has been 30 years since the pentagon with similar effects was last discovered. This discovery is equivalent to finding new atomic particles in the field of mathematics. According to the report, the research team consists of Kathy Mann, associate professor of mathematics at the University of Washington, his wife Jennifer and student Von Delau. Kathy Mann and his wife specialize in mathematical tiling and node theory, and have been working hard to find a "perfect pentagonal". The report pointed out that the two finally used a computer program designed by Feng Delao to find the perfectly inlaid pentagonal shape. Cassie Mann said the discovery will help people thoroughly understand how different shapes lay flat surfaces together. 15 types of inlaid pentagons discovered so far