sympy/sympy — pull request #2613 by skirpichev (2013-11-19 12:28:30+00:00)
Title: Implement a new syntax for multivariable Order symbol (v2)

This is an alternative for #2605

Supported input:
* `O(expr)`
* `O(expr, (var1, pt1), (var2, pt2), ...)`
* `O(expr, var1, var2, ...) == O(expr, (var1, 0), (var2, 0), ...)`

- [ ] rebase?