progress for the day (tuesday)

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+Chapter 5: Integration
+=========================
+
+Introduces higher-order forms.
+
+Wedge products, which generate higher-order forms. Went through this pretty
+fast, I think this section is where a bunch of tensor indexing tricks are
+skipped, or would have been.
+
+In this chapter, much of this content is only defined for euclidean R2 or R3,
+need metrics for the general case.
+
+---
+
+As a side note, having `define-coordinates` also define things like `d/dx` and
+just `dx` feels like kind of a syntactic sugar trick.