hjelmslev's theorem

Questions

What does hjelmslev's theorem mean?

a theorem stating that if a set of points P_i lying on a line is isometrically mapped to points P_i' on a different line, then the midpoints of the segments P_iP_i' also lie on a line.

Where does hjelmslev's theorem come from?

Named after Johannes Hjelmslev.

How to pronounce hjelmslev's theorem

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