Subject: Positivity IX, July 17-21, 2017 Dear Colleagues, This is the first announcement for Positivity IX, an international conference devoted to ordered structures and their applications. The conference will be held on July 17-21, 2017 at the University of Alberta, Edmonton, Canada. The conference web site can be found here: http://www.math.ualberta.ca/~vtroitsky/positivity2017 Please feel free to forward this information to anyone who may be interested. We would appreciate if you could inform us of your intention to participate as soon as possible. We are looking forward to your participation in Positivity IX. Kind regards, Vladimir Troitsky and Foivos Xanthos