After having submitted my Ph.D. recently, I am working on a first solo paper (without my advisors). I have some interesting results, but, I have difficulty in formalizing some of the mathematical arguments. I tried to send the manuscript to some mathematicians for comments, and they said they will read it when they have time, but so far, apparently, they did not have time.
So, I scheduled a presentation in a local math department seminar. My hope is that, when people come to a seminar, they have more time to listen, and probably some of them will be able to help me. My concern is that, presenting such half-baked results might make me look unprofessional.
So, my question is: what is the best way to present such results in a way that will encourage interested listeners to collaborate with me, while not creating a negative impression?