a remark about alternative universe handling
remove "merely" and mention "directedness" #317
clarify and index Fin(n), fix #294 and see #297
another example of a polymorphic function, close #297
fix #305
more comments on universes, fix #296
Merge pull request #319 from mikeshulman/fin

finite types and polymorphic functions
Merge pull request #320 from mikeshulman/fiberseq

fix #305
Merge pull request #317 from mikeshulman/universes

a remark about alternative universe handling
explain recursion on product types better, fix #311
remove tilde, fix #309
Merge pull request #321 from mikeshulman/products

explain recursion on product types better, fix #311
base is a point in the 1-sphere, not a nat
Merge pull request #322 from jcreedcmu/master

base is a point in the 1-sphere, not a nat
typo
Math font macros in superscripts now enclosed in braces.  Example:
1^\mathsf{W} becomes 1^{\mathsf{W}}.

This makes no difference to the resulting typeset material, but makes
it possible to use ^ as a *macro* rather than the math superscript
token.  There are some packages that make ^ an active character to
make superscript (and subscript) handling more flexible.  The ePub
conversion class is one of these.
Another math font in a superscript that could do with being in braces.
fix sort order in index
fix some too-long lines in ustrade format
explain ctx judgment more, fix #315