Special relativity and steps towards general relativity/image gallery

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SR

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spacetime unchanged, coordinate system "rotated"

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invariant interval

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rapidities add to arbitrarily big positive or negative numbers

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standard SR effects

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tachyons: what if they exist?

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past time cone, here-now, future time cone, elsewhere, null boundaries

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avoid wrong assumptions, otherwise paradoxes

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Ladder (= pole-barn) paradox

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Multiply connected twins paradox

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Dynamics

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GR

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co- versus contra-variant: how coordinates and basis vectors change

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a coordinate is a scalar field, coordinate singularity

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vector and 1-form field bases

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charts, atlas, manifold

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parallel transport

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