collectiveidea/unicode_math — pull request #10 by knsmr (2012-10-12 23:20:26+00:00)
Title: Add set operators: ∩ (intersection) / ∪ (union)

Should we also extend Set?

I am not sure why we don't simply do something like this:

~~~ruby
class Array
alias :∩ :&
alias :∪ :|
end
~~~