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rogueviz::ds::tour:: fixed the formula for dS2
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@ -685,7 +685,7 @@ slide relhell_tour[] = {
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latex_slide(mode, defs+R"=(
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{\color{remph}de Sitter spacetime:}
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\begin{itemize}
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\item $\dS{2} = \{(x,y,z,t) \in \bbE^{3,1}: \\ x^2+y^2+z^2-t^2=-1\}$
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\item $\dS{2} = \{(x,y,z,t) \in \bbE^{3,1}: \\ x^2+y^2+z^2-t^2=1\}$
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\item take $t=0$ -- we get $\bbS^2$
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\item the universe is expanding with $t$ \\ (not if we apply Lorentz transformation)
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\end{itemize}
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