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1941 May, “Jubilee of the City Tube”, in Railway Magazine, page 224:
The fare was fixed at 2d., irrespective of distance, and was paid by passengers on passing through turnstiles at each station.
A similar device in a footpath to allow people through one at a time while preventing the passage of cattle.
(mathematics,logic) The symbol used to represent logical entailment (deducibility relation), especially of the syntactic type; i.e., syntactic consequence. (Such symbol can be read as "prove(s)" [1] or "give(s)". [2])
^ “Archived copy”, in (Please provide the book title or journal name), 2012 November 21 (last accessed), archived from the original on 9 November 2011
^ Kleene, Stephen Cole. Mathematical Logic. Mineola, New York: Dover Publications, 2002. Ch. VI, §48, p. 286.
