2006-06-17 wenzelm mutual_rule: proper context;
2006-06-17 wenzelm export: simultaneous facts, refer to Variable.export;
2006-06-17 wenzelm ProofContext.exports: simultaneous facts;
2006-06-17 wenzelm Variable.importT_inst;
2006-06-17 wenzelm standard: simultaneous facts;
2006-06-17 wenzelm added singleton;
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