lot about ride-sharing platforms already so let me just skip that I think at this point in the week between the the talk that was given by Christos Co on Monday and then also the industrial visitors day we had last week we all are familiar with uber and lyft and sidecar and platforms like this so what's our goal in our work oh and I should actually start preface this by saying this is joint work with Sid Banerjee who's an assistant professor at Cornell he was doing a postdoc with me and Carlos raqami who's a student of mine at