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In mathematics, 6-sphere coordinates are a coordinate system for three-dimensional space obtained by inverting the 3D Cartesian coordinates across the unit 2-sphere + + =.They are so named because the loci where one coordinate is constant form spheres tangent to the origin from one of six sides (depending on which coordinate is held constant and whether its value is positive or negative).
Apeirophobia (from Ancient Greek: ᾰ̓́πειρος, romanized: ápeiros, lit. 'infinite, boundless') is the phobia of infinity or eternity, causing discomfort and sometimes panic attacks. [2] It normally starts in adolescence or earlier and it is currently not known how it normally develops over time. Apeirophobia may be caused by ...
Edward Larsson's rune cipher resembling that found on the Kensington Runestone.Also includes runically unrelated blackletter writing style and pigpen cipher.. In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure.
This is the annular Soddy's hexlet (Figure 2). Six spheres s 1 –s 6 may be packed around c and likewise sandwiched between the bounding planes a and b. Re-inversion restores the three original spheres, and transforms s 1 –s 6 into a hexlet for the original problem. In general, these hexlet spheres S 1 –S 6 have different radii.
The 6-sphere, or hypersphere in seven dimensions, is the six-dimensional surface equidistant from a point. It has symbol S 6, and the equation for the 6-sphere, radius r, centre the origin is = {: ‖ ‖ =}. The volume of the space bounded by this 6-sphere is
The dust jacket of the US version of Dan Brown's 2003 novel The Da Vinci Code contains two references to Kryptos—one on the back cover (coordinates printed light red on dark red, vertically next to the blurbs) is a reference to the coordinates mentioned in the plaintext of passage 2, except the degree digit is off by one. When Brown and his ...
The Parkerian hexad is a set of six elements of information security proposed by Donn B. Parker in 1998. The Parkerian hexad adds three additional attributes to the three classic security attributes of the CIA triad (confidentiality, integrity, availability).
The German Enigma used a combination key to control the operation of the machine: rotor order, which rotors to install, which ring setting for each rotor, which initial setting for each rotor, and the settings of the stecker plugboard.