Desargues's theoremIn projective geometry, Desargues's theorem, named after Girard Desargues, states: Two triangles are in perspectiveaxiallyif and only if they are in perspective centrally.Two triangles are in perspective axially if corresponding sides of the triangles, when extended, meet at points on a line, called the axis of perspectivity.
Desargues graphIn the mathematical field of graph theory, the Desargues graph is a distance-transitive, cubic graph with 20 vertices and 30 edges. It is named after Girard Desargues, arises from several different combinatorial constructions, has a high level of symmetry, is the only known non-planar cubic partial cube, and has been applied in chemical databases.
Desargues (crater)Desargues is an ancient lunarimpact crater that is located near the northern limb of the Moon, on the western hemisphere. It lies nearly due south of the crater Pascal, and southeast of Brianchon. The proximity of this crater to the limb means that it appears highly elongated due to foreshortening, and it is difficult to discern details from the Earth.
Projective geometryType of geometry In mathematics, projective geometry is the study of geometric properties that are invariant with respect to projective transformations. This means that, compared to elementary Euclidean geometry, projective geometry has a different setting (projective space) and a selective set of basic geometric concepts.
LyonCity in FrancePrefecture and commune in Auvergne-Rhône-Alpes, FranceLyon (Franco-Provençal: Liyon; formerly Lyons in English) is a city in France. It is located at the confluence of the rivers Rhône and Saône, to the northwest of the French Alps, 391 km (243 mi) southeast of Paris, 278 km (173 mi) north of Marseille, and 113 km (70 mi) southwest of Geneva, Switzerland.
ArchitectureArt and technique of designing buildingsIn adding the dome to the Florence Cathedral (Italy) in the early 15th century, the architect Filippo Brunelleschi not only transformed the building and the city, but also the role and status of the architect.Bauhaus building (Germany). The Bauhaus style co-started modernist architecture.Architecture is the study and practice of designing structures, especially habitable ones.
Cardinal RichelieuFrench statesman and clergyman (1585–1642)Armand Jean du Plessis, 1st Duke of Richelieu (9 September 1585 – 4 December 1642), commonly known as Cardinal Richelieu, was a French Catholic prelate and statesman who had an outsized influence in civil and religious affairs. He became known as the Red Eminence (French: l'Éminence Rouge), a term derived from the style of Eminence applied to cardinals and their customary red robes.
SeneschalA seneschal ( ) is most commonly, a senior position filled by a court appointment within a royal, ducal, or noble household during the Middle Ages and early Modern period – historically a steward or majordomo of a medieval great house.
TitheReligious donation (Learn how and when to remove this message) Collection Economic nexus in the United States Revenue service Revenue stamp Tax assessment Taxable income Tax lien Tax refund Tax shield Tax residence Tax preparation Tax protester Tax investigation Tax collector Tax withholding Private tax collection Noncompliance Types Direct Indirect Per unit Ad valorem Aviation Airport improvement Landing Solidarity Capital gains Exit Consumption Departure Hotel Sales Stamp Television Tourist Value-added Digital goods Dividend Environmental tax Carbon Eco-tariff Landfill Natural resources consumption Severance Steering Stumpage Excise Alcohol Fat Meat Sin Sugary drink Tobacco General Georgist Gift Gross receipts Hidden Hypothecated Income Inheritance (estate) Internet tax Land value Luxury Mining On childlessness Payroll Pigouvian Property Resource rent Single Stealth Surtax Turnover Use User charge/fee Congestion Fuel Road/GNSS Toll Vehicle miles traveled Corporate profit Excess profits Windfall Negative (income) Wealth International Financial transaction tax ATTAC Currency transaction tax European Union Common Consolidated Corporate Tax Base (CCCTB) Global minimum corporate tax rate Robin Hood tax Tobin tax Spahn tax Tax equalization Tax treaty Exchange of Information Permanent establishment Transfer pricing European Union FTT Foreign revenue rule Trade Custom Duty Tariff Import Export Tariff war Free trade Free-trade zone Trade agreement ATA Carnet Research Religious Church tax Eight per thousand Teind Tithe Fiscus Judaicus Leibzoll Temple tax Tolerance tax Jizya Kharaj Khums Nisab Zakat By country Business portal Money portalvte The Tithe Pig, group in Derby Porcelain, c. 1770 Porcelain figure of a priest collecting the tithe (Austria) A tithe (/taɪð/; from Old English: teogoþa "tenth") is a one-tenth part of something, paid as a contribution to a religious organization or compulsory tax to government.
MathematicianA mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. HistoryOne of the earliest known mathematicians was Thales of Miletus (c. 624 – c. 546 BC); he has been hailed as the first true mathematician and the first known individual to whom a mathematical discovery has been attributed.
EpicycloidIn geometry, an epicycloid (also called hypercycloid) is a plane curve produced by tracing the path of a chosen point on the circumference of a circle—called an epicycle—which rolls without slipping around a fixed circle. It is a particular kind of roulette. An epicycloid with a minor radius (R2) of 0 is a circle. This is a degenerate form.
MoonNatural satellite orbiting EarthSurface absorbed doserate13.2 μGy/h(during lunar daytime)Surface equivalent doserate57.0 μSv/h(during lunar daytime)Apparent magnitude−2.5 to −12.9−12.74 (mean full moon)Absolute magnitude (H)0.2Angular diameter29.3 to 34.1 arcminutesAtmosphereSurface pressure10 Pa (1 picobar) (day)10 Pa (1 femtobar) (night)Composition by volumeHeArNeNaKHThe Moon is the only natural satellite of Earth.*As an Amazon Associate I earn from qualifying purchases.