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block system

The English word “block system” has 2 meanings listed here.

noun

  1. On railways, a system by which the track is divided into sections of three or four miles, and trains are run by the guidance of electric signals so that no train enters a section or block before the preceding train has left it.
  2. Given a group G that acts on a set X, a partition of X that is G-invariant.
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