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expandinguniverse

Coordinate Dependent Statements in an Expanding Universe

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In this Insight we will discuss the general Friedmann--Lemaitre--Robertson--Walker…
RelativityVariables

Relativity Variables: Velocity, Doppler-Bondi k, and Rapidity

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Traditional presentations of special relativity place emphasis…

Relativity on Rotated Graph Paper

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This Insight is a follow up to my earlier tutorial Insight (Spacetime…

Spacetime Diagrams of Light Clocks

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We demonstrate a method for constructing spacetime diagrams for…