Automatically created functions:+
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+
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  ty1_tyn.bn[simp]        lifted equations for bn funs+
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  ty1_tyn.fv[simp]        lifted equations for fv funs+
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  ty1_tyn.perm[simp]      lifted permutation equations+
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  ty1_tyn.distinct[simp]  lifted distincts+
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  ty1_tyn.eq_iff+
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  ty1_tyn.induct+
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  ty1_tyn.inducts+
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  instance ty1 and tyn :: fs+
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  ty1_tyn.supp            empty when for too many bindings+
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+
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Smaller things:+
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+
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- maybe <type>_perm whould be called permute_<type>.simps;+
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  that would conform with the terminology in Nominal2+
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+
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- we also need to lift the size function for nominal+
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  datatypes+
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+
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Bigger things:+
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+
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- nested recursion, like types "trm list" in a constructor+
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+
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- strong induction rules+
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+
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- check support equations for more bindings per constructor+
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+
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- automate the proofs that are currently proved with sorry:+
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  alpha_equivp+
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+
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- store information about defined nominal datatypes, so that+
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  it can be used to define new types that depend on these+
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+
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- make parser aware of bn functions that call other bn functions+
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  and reflect it in the datastructure passed to Fv/Alpha generation+
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+
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- make parser aware of recursive and of different versions of abs+
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+
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Less important:+
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+
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- fv_rsp uses 'blast' to show goals of the type:+
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  a u b = c u d   ==>  a u x u b = c u x u d+
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