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7 is the only number D for which the equation 2 n − D = x 2 has more than two solutions for n and x natural. In particular, the equation 2 n − 7 = x 2 is known as the Ramanujan–Nagell equation. 7 is one of seven numbers in the positive definite quadratic integer matrix representative of all odd numbers: {1, 3, 5, 7, 11, 15, 33}. [19] [20]
First page of a 1555 version of the Siete Partidas, as annotated by Gregorio López.. The Siete Partidas (Spanish pronunciation: [ˈsjete paɾˈtiðas], "Seven-Part Code") or simply Partidas, was a Castilian statutory code first compiled during the reign of Alfonso X of Castile (1252–1284), with the intent of establishing a uniform body of normative rules for the kingdom.
The Diccionario de la lengua española [a] (DLE; [b] English: Dictionary of the Spanish language) is the authoritative dictionary of the Spanish language. [1] It is produced, edited, and published by the Royal Spanish Academy , with the participation of the Association of Academies of the Spanish Language .
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The oldest surviving written account of Popol Vuh (ms c. 1701 by Francisco Ximénez, O.P.). Popol Vuh (also Popul Vuh or Pop Vuj) [1] [2] is a text recounting the mythology and history of the Kʼicheʼ people of Guatemala, one of the Maya peoples who also inhabit the Mexican states of Chiapas, Campeche, Yucatan and Quintana Roo, as well as areas of Belize, Honduras and El Salvador.
Seven Myths of the Spanish Conquest was first published 2003 in cloth (hardcover) edition by OUP, with a paperback edition released the following year. A Spanish-language edition (under the title Los siete mitos de la conquista española) was published by Paidós, with imprints issued in Spain (Barcelona, November 2004) and Mexico (2005).
The book thus made an important contribution to the spread of decimal numerals. The spread of the Hindu-Arabic system, however, as Ore writes, was "long-drawn-out", taking many more centuries to spread widely, and did not become complete until the later part of the 16th century, accelerating dramatically only in the 1500s with the advent of ...