* Pure/library.ML: several combinators for linear functional transformations;
* Pure/library.ML: canonical list combinators fold, fold_rev, and fold_yield;
* Pure/term.ML: combinators fold_atyps, fold_aterms, fold_term_types, fold_types;
%FIXME
%\chapter{Basic Concepts}\label{ch:basics}
%\section{The Isar proof language}
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