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J. West

Publications and source records attributed to J. West.

20 records · Page 2Linked to original sources

The differential aging of inertial and non-inertial observers: The Eyewitness observations of a relativistic polygon traveler

The time dilation of non-inertial travelers in circular and polygonal closed paths are well known. In both cases observers completing a round trip will age less than an observer at rest with respect to the circle / polygon. This rapid aging is contrary to the slow aging that would be documented by temporarily comoving inertial observers who might also move along each edge of the polygon. A detailed description of what the non-inertial observer might actually see that would explain their own slow aging is presented. It is also argued that the non-inertial observer will disagree with the comoving inertial observers about the size of the diameter of the polygon. In particular, the non-inertial traveler will observer a Lorentz-like contraction of distances measured perpendicular to the direction of relative motion. As a result, the traveler will obtain a value of for the ratio of circumference to diameter, in contradiction to recently published work that predicts a measured ratio less than and a non-Euclidean geometry for the polygon traveler.

physics.pop-ph↗

Avoiding 2-letter signed patterns

Let B_n be the hyperoctahedral group; that is, the set of all signed permutations on n letters, and let B_n(T) be the set of all signed permutations in B_n which avoids a set T of signed patterns. In this paper, we find all the cardinalities of the sets B_n(T) where $T \subseteq B_2$. This allow us to express these cardinalities via inverse of binomial coefficients, binomial coefficients, Catalan numbers, and Fibonacci numbers.

math.CO↗