Thu, 15 Jun 2006 23:08:56 +0200 added variable.ML;
wenzelm [Thu, 15 Jun 2006 23:08:56 +0200] rev 19898
added variable.ML;
Thu, 15 Jun 2006 23:08:54 +0200 ProofContext: moved variable operations to struct Variable;
wenzelm [Thu, 15 Jun 2006 23:08:54 +0200] rev 19897
ProofContext: moved variable operations to struct Variable;
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