Fri, 07 Jul 1995 13:57:43 +0200 clasohm moved mixfix syntax from sign.ML
Fri, 07 Jul 1995 13:57:24 +0200 clasohm moved mixfix syntax to Syntax/mixfix.ML
Wed, 05 Jul 1995 20:14:22 +0200 nipkow Added insert_not_empty, UN_empty and UN_insert (to set_ss).
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