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Learn about the history, variations and insecurity of the pigpen cipher, a geometric simple substitution cipher that uses symbols in a grid. The cipher is also known as the masonic cipher, Rosicrucian cipher, Napoleon cipher and tic-tac-toe cipher.
Learn about the four-square cipher, a manual symmetric encryption technique invented by French cryptographer Felix Delastelle. It encrypts pairs of letters (digraphs) using four 5 by 5 matrices and a keyword.
The chapter on areas includes both trigonometric formulas and Heron's formula for computing the area of a triangle from its side lengths, and the chapter on inequalities includes the Erdős–Mordell inequality on sums of distances from the sides of a triangle and Weitzenböck's inequality relating the area of a triangle to that of squares on ...
The following pseudocode describes a basic implementation of the Bowyer-Watson algorithm. Its time complexity is ().Efficiency can be improved in a number of ways. For example, the triangle connectivity can be used to locate the triangles which contain the new point in their circumcircle, without having to check all of the triangles - by doing so we can decrease time complexity to ().
Learn how to identify the symbols and logos used by pedophiles to indicate their sexual preferences and promote their cause. See images of the symbols and read the FBI document obtained by Wikileaks.
The ten-of-diamonds can be dissected in an octagonal cross-section between the two rhombic faces. It is a decahedron with 12 vertices, 20 edges, and 10 faces (4 triangles, 4 trapezoids, 1 rhombus, and 1 isotoxal octagon). Michael Goldberg labels this polyhedron 10-XXV, the 25th in a list of space-filling decahedra. [2]
Learn about the meanings and origins of various symbols used by Scientology, the Church of Scientology, and related organizations. See images and descriptions of the Scientology symbol, the Dianetics symbol, the Operating Thetan symbol, and more.
Construct a d-dimensional triangle (a 3-dimensional triangle is a tetrahedron) by placing additional dots below an initial dot, corresponding to P d (1) = 1. Place these dots in a manner analogous to the placement of numbers in Pascal's triangle. To find P d (x), have a total of x dots composing the target shape.