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[89] [277] For example, the problem known as the Gambler's ruin is based on a simple random walk, [195] [278] and is an example of a random walk with absorbing barriers. [ 241 ] [ 279 ] Pascal, Fermat and Huyens all gave numerical solutions to this problem without detailing their methods, [ 280 ] and then more detailed solutions were presented ...
Of the ten possible types of triple junctions only a few are stable through time (stable in this context means that the geometrical configuration of the triple junction will not change through geologic time). The meeting of four or more plates is also theoretically possible, but junctions will only exist instantaneously.
A south London restaurant owner said he was “so happy” after completing a 3,000-mile walking challenge across every London borough for charity.
In mathematics, a self-avoiding walk (SAW) is a sequence of moves on a lattice (a lattice path) that does not visit the same point more than once. This is a special case of the graph theoretical notion of a path. A self-avoiding polygon (SAP) is a closed self-avoiding walk on a lattice. Very little is known rigorously about the self-avoiding ...
A theoretical idea for enabling interstellar travel is to propel a starship by creating an artificial black hole and using a parabolic reflector to reflect its Hawking radiation. Although beyond current technological capabilities, a black hole starship offers some advantages compared to other possible methods.
For the wealthy, long voyages around the world, such as was done by Ulysses S. Grant, became possible in the 19th century, and the two World Wars moved vast numbers of troops around the planet. However, it was the rise of commercial aviation in the late 20th century that made circumnavigation, when compared to the Magellan–Elcano expedition ...
Another theoretically possible means to become airborne on Titan would be to use a hot air balloon-like vehicle filled with an Earth-like atmosphere at Earth-like temperatures (because oxygen is only slightly denser than nitrogen, the atmosphere in a habitat on Titan would be about one third as dense as the surrounding atmosphere), although ...
At some point it will start to fall, resulting in a gravitomagnetically induced spinward motion. An implication of this dragging of space is the existence of negative energies within the ergosphere. Since the ergosphere is outside the event horizon, it is still possible for objects that enter that region with sufficient velocity to escape from ...