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3D model of a compound of ten tetrahedra. The compound of ten tetrahedra is one of the five regular polyhedral compounds. This polyhedron can be seen as either a stellation of the icosahedron or a compound. This compound was first described by Edmund Hess in 1876. It can be seen as a faceting of a regular dodecahedron.
3D printing marketplaces are a combination of file sharing websites, with or without a built in e-commerce capability. Designers upload suitable files for 3D printing whilst other users buy or freely download the uploaded files for printing. The marketplaces facilitate the account management, infrastructure, server resources and guarantees safe ...
Developed by. 3D Systems. Initial release. 1987. Type of format. Stereolithography. STL is a file format native to the stereolithography CAD software created by 3D Systems. [ 3][ 4][ 5] Chuck Hull, the inventor of stereolithography and 3D Systems’ founder, reports that the file extension is an abbreviation for stereolithography. [ 6]
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The history of St. Louis, Missouri from 1981 to the present has been marked by city beautification and crime prevention efforts, a major school desegregation case, and gentrification in its downtown area. St. Louis also continues to struggle with crime and a declining population, although some improvement has been made in both of these aspects.
St. Louis skyline, seen from across the Mississippi River. One Metropolitan Square, pictured at night, designed by the architects Hellmuth, Obata & Kassabaum.. The skyline of St. Louis is home to some of the most architecturally significant buildings in the United States, from its eye catching Gateway Arch to its beautiful granite facade, copper roofed One Metropolitan Square.
St. Louis Lambert International Airport ( IATA: STL, ICAO: KSTL, FAA LID: STL) is the primary international airport serving metropolitan St. Louis, Missouri, United States. Commonly referred to as Lambert Field or simply Lambert, it is the largest and busiest airport in the state of Missouri. The airport covers 3,793 acres (1,535 ha) [ 2][ 3 ...
Viète. de Moivre. Euler. Fourier. v. t. e. In trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles.