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Short title: Author: Date and time of digitizing: 12:53, 19 January 2001: Software used: Adobe PageMaker 6.5: File change date and time: 07:32, 9 October 2008
Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [32] Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's ...
Margaret Petherbridge Farrar (March 23, 1897 – June 11, 1984) was an American journalist and the first crossword puzzle editor for The New York Times (1942–1968). Creator of many of the rules of modern crossword design, she compiled and edited a long-running series of crossword puzzle books – including the first book of any kind that Simon & Schuster published (1924). [1]
Before version 4.2, GeoGebra was published under the GNU General Public License (GPL-3.0-or-later). After version 4.2 the licensing was changed. [ 12 ] GeoGebra's source code, except the installers, web services, user interface image and style files, and documentation and language files, is licensed under the GNU General Public License (GPL-3.0 ...
Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.
Algebra is the branch of mathematics that studies certain abstract systems, known as algebraic structures, and the manipulation of expressions within those systems. It is a generalization of arithmetic that introduces variables and algebraic operations other than the standard arithmetic operations, such as addition and multiplication.
If (C 1, Δ 1, ε 1) and (C 2, Δ 2, ε 2) are two coalgebras over the same field K, then a coalgebra morphism from C 1 to C 2 is a K-linear map f : C 1 → C 2 such that () = and =. In Sweedler's sumless notation, the first of these properties may be written as:
Gauss produced two other proofs in 1816 and another incomplete version of his original proof in 1849. The first textbook containing a proof of the theorem was Cauchy's Cours d'analyse de l'École Royale Polytechnique (1821). It contained Argand's proof, although Argand is not credited for it. None of the proofs mentioned so far is constructive.