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@@ -2,6 +2,7 @@ These are some advanced notes extending the material presented this week. Don't
 
 [[!toc]]
 
+<a id=multivalues></a>
 ### More on multivalues ###
 
 A multivalue is a series of *zero or more* values. They are the result of evaluating expressions that consist of *zero or more* expressions, separated by commas, and enclosed in parentheses. So these expressions evaluate to multivalues:
@@ -129,6 +130,7 @@ Both of these strategies work. But they are a bit inefficient. I said you didn't
     end
 
 
+<a id=dollar></a>
 ### $ Syntax ###
 
 Haskell has a useful bit of syntax that we will adopt. They use `$` as an infix operator that has the same kind of effect as Russell &amp; Whitehead's period. It is semantically inert, and only affects grouping. It enables you to avoid some parentheses in lots of situations. For example, if you want to check that a sequence `xs` is not empty, you'd express that like this: