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Talking about concepts ii
Talking about geometry
Talking about algebra
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4-momentum 4-velocity algebra arrow atomic clock blackboard Captain chapter clock clock-cloud components confusion curvature tensor curves deuteron distance Einstein Euclidean Euclidean geometry event fact field equations flat space-time formulae four agents four coordinates four-dimensional function-box functions geodesic geometry gravitational field idea intersection light-signal line-element Lorentz transformation M-geometry M2-world of relativity Majesty Mary Jane mass mathematical matter means measure metric matrix metric tensor Mi-world of Newton Minkowskian notebooks null cone number system observers operator-box particle Penelope perhaps photon physicists physics pseudo-clock Pygmalion syndrome Queen breakfasting R-point R-world real number realised relativistic represent rigid body rods S-plane S'-clock sheets of squared signal simple skin-tight garment skipper space-time diagram special relativity special theory squared paper surface talking theory of relativity thing thought ticks time-interval time-order tion triangle triangle inequality variable vector velocity word world line write zero