### changeset 129:fd52e2a7ffc3

s/reflexive/index function
author Adam Chlipala Wed, 22 Oct 2008 07:50:47 -0400 99be59b9e20d 464db50b210a src/DataStruct.v 1 files changed, 1 insertions(+), 1 deletions(-) [+]
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--- a/src/DataStruct.v	Mon Oct 20 17:02:04 2008 -0400
+++ b/src/DataStruct.v	Wed Oct 22 07:50:47 2008 -0400
@@ -831,7 +831,7 @@

%\item%#<li># Define a tree analogue of [hlist].  That is, define a parameterized type of binary trees with data at their leaves, and define a type family [htree] indexed by trees.  The structure of an [htree] mirrors its index tree, with the type of each data element (which only occur at leaves) determined by applying a type function to the corresponding element of the index tree.  Define a type standing for all possible paths from the root of a tree to leaves and use it to implement a function [tget] for extracting an element of an [htree] by path.  Define a function [htmap2] for "mapping over two trees in parallel."  That is, [htmap2] takes in two [htree]s with the same index tree, and it forms a new [htree] with the same index by applying a binary function pointwise.

-  Repeat this process so that you implement each definition for each of the three definition styles covered in this chapter: inductive, recursive, and reflexive.#</li>#
+  Repeat this process so that you implement each definition for each of the three definition styles covered in this chapter: inductive, recursive, and index function.#</li>#

%\item%#<li># Write a dependently-typed interpreter for a simple programming language with ML-style pattern-matching.  The language is defined informally by this grammar: