CTAN just announced a new package, turnstile:
turnstile is a style based on article.cls to be used for typesetting articles. Among other uses, the turnstile sign is used by logicians for denoting a consequence relation, related to a given logic, between a collection of formulas and a formula. Many logicians have complaint the lack of a \LaTeX\ routine for issuing turnstile signs, in any of the forms it could arise.
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