Remove some non-ASCII characters (Unicode subtractions in this case)
A shell-script to grep for non-ASCII in src/
A theory enabling list range syntax like [10 ..< z * 3]

Also enables [10 .. 20], but this has fewer nice theorems, mostly
because of natural number subtraction. In particular, there is no x
such that [0 .. x] is the empty list, which breaks a bunch of theorems
you might like.
Merge branch 'master' of github.com:mn200/HOL