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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
Aurelio Ángel Baldor de la Vega (October 22, 1906, Havana, Cuba – April 2, 1978, Miami) was a Cuban mathematician, educator and lawyer. [1] Baldor is the author of a secondary school algebra textbook, titled Álgebra, used throughout the Spanish-speaking world and published for the first time in 1941. He is also the author of the following ...
A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are used to ...
Cryptic crosswords often use abbreviations to clue individual letters or short fragments of the overall solution. These include: Any conventional abbreviations found in a standard dictionary, such as:
Cadabra is a computer algebra system designed specifically for the solution of problems encountered in classical field theory, quantum field theory and string theory. The first version of Cadabra was developed around 2001 for computing higher-derivative string theory correction to supergravity. [2] [3]
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]
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:
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.