Special relativity and steps towards general relativity/image gallery

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spacetime unchanged, coordinate system "rotated"[edit]

invariant interval[edit]

rapidities add to arbitrarily big positive or negative numbers[edit]

standard SR effects[edit]

tachyons: what if they exist?[edit]

past time cone, here-now, future time cone, elsewhere, null boundaries[edit]

avoid wrong assumptions, otherwise paradoxes[edit]

Ladder (= pole-barn) paradox[edit]

Multiply connected twins paradox[edit]



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

a coordinate is a scalar field, coordinate singularity[edit]

vector and 1-form field bases[edit]

charts, atlas, manifold[edit]

parallel transport[edit]