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The Rubik's Cube is a 3D combination puzzle invented in 1974 [2][3] by Hungarian sculptor and professor of architecture Ernő Rubik. Originally called the Magic Cube, [4] the puzzle was licensed by Rubik to be sold by Pentangle Puzzles in the UK in 1978, [5] and then by Ideal Toy Corp in 1980 [6] via businessman Tibor Laczi and Seven Towns ...
The reverse side of the Great Seal of the United States (1776). The Latin phrase novus ordo seclorum, appearing on the reverse side of the Great Seal since 1782 and on the back of the U.S. one-dollar bill since 1935, translates to "New Order of the Ages", [1] and alludes to the beginning of an era where the United States of America is an independent nation-state; conspiracy theorists claim ...
The CFOP method (Cross – F2L – OLL – PLL), also known as the Fridrich method, is one of the most commonly used methods in speedsolving a 3×3×3 Rubik's Cube. It is one of the fastest methods with the other most notable ones being Roux and ZZ. This method was first developed in the early 1980s, combining innovations by a number of speed ...
The Mason–Dixon line is a demarcation line separating four U.S. states: Pennsylvania, Maryland, Delaware and West Virginia. It was surveyed between 1763 and 1767 by Charles Mason and Jeremiah Dixon as part of the resolution of a border dispute involving Maryland, Pennsylvania, and Delaware in the colonial United States.
Doubling the cube is the construction, using only a straightedge and compass, of the edge of a cube that has twice the volume of a cube with a given edge. This is impossible because the cube root of 2, though algebraic, cannot be computed from integers by addition, subtraction, multiplication, division, and taking square roots.
The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. [1] It is a simple wire-frame , two dimensional drawing of a cube with no visual cues as to its orientation , so it can be interpreted to have either the lower-left or the upper-right square as its front side.
Thomas Jefferson becomes the 3rd president of the United States on March 4, 1801. First Barbary War, 1801–1805. The Territory Northwest of the River Ohio is admitted to the Union as the State of Ohio (the 17th state) on March 1, 1803. The United States takes possession of the Louisiana Purchase, December 20, 1803.
This definition of covering dimension can be extended from the class of normal spaces to all Tychonoff spaces merely by replacing the term "open" in the definition by the term "functionally open". An inductive dimension may be defined inductively as follows. Consider a discrete set of points (such as a finite collection of points) to be 0 ...