fix reference
working on inductive types
improve weird inductive types in 5.6 and exercises, close #615
Merge pull request #628 from mikeshulman/weird-inductive-types

Weird inductive types
Add labels to all exercises without them.

This way, we can hook them up with the HoTT repository.  Labels were
sometimes made by keyword-pulling, when I couldn't immediately think
of a good name for the exercise.  I don't care much what the labels
are, but I would like all the exercises to have labels.
Typo in exercise 7.8
unmarked errata for a533a6b
Merge pull request #633 from mikeshulman/ex7.8

Typo in exercise 7.8
Merge pull request #632 from JasonGross/label-exercises

Add labels to all exercises without them.
Mark Errata (auto)
Logical equivalence between torus and product of circles
Insert missing 'e' on lhs invocation of W-elim.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Merge pull request #645 from ezyang/master

Insert missing 'e' on lhs invocation of W-elim.
errata for 0c6f0c8
Mark Errata (auto)
Increment theorem counter after Lemma 6.5.4.

There used to be a numbered equation (6.5.5) in the proof of 6.5.4,
but it was removed by commit 8f54d16.  Incrementing the counter anyway
ensures that if we ever add new theorems or equations at the end of
section 6.5, they will start with 6.5.6, preventing any confusion.
Added solutions to exercises 6.1 and 6.3
Merge remote-tracking branch 'upstream/master'
kristina's torus
Merge pull request #646 from awodey/master

kristina's torus