A geometer is a mathematician whose area of study is geometry. To contemporaries he was also known as a mathematician and geometer. A mathematician who works in the field of geometry is called a geometer. He was the brother of the geometer and astronomer Adriaan Metius. An inchworm is the caterpillar of a geometer moth. They were discovered by Apollonius of Perga, a renowned Greek geometer. He has been considered the greatest pure geometer since Apollonius of Perga. Apollonius was a prolific geometer, turning out a large number of works. In many species of geometer moths, the inchworms are about long. Several other geometer moths are notorious pests. God was the great geometer, and this concept inspired the architect. "Grand Geometer" or something similar. He studied with the well-known Austrian geometer Wilhelm Blaschke. Einstein had learned about them, with great difficulty, from the geometer Marcel Grossmann. It is named after the English geometer Thomas Willmore.