Dear Walter, You wrote:

Briefly: 100% credit for the solution belongs to you.

This is very kind of you to say that! But you have a contribution, since your partial solution stimulated me to think more about the problem. Benabou also contributed by formulating the problem. Best, André -------- Message d'origine-------- De: categories@mta.ca de la part de tholen@mathstat.yorku.ca Date: dim. 02/05/2010 21:06 À: Joyal, André Objet : categories: Re: Four problems(corrected2) Dear Andre, You are overly generous when you describe your clever solution to Jean's Problem 4 as being "along the lines [I] suggested". The theorem with Rosicky that I had mentioned is at most a precursor to your result; besides, we proved that theorem only after a remark that you made after my talk at the CT meeting at Halifax/White Point. Briefly: 100% credit for the solution belongs to you. Bravo, Walter. Andre Joyal wrote: [For admin and other information see: http://www.mta.ca/~cat-dist/ ]