 All right, so before we start with the afternoon session, well, so I'm gonna introduce myself again. I'm Yves Meyere And I'm gonna actually I'm gonna impersonate Yves Meyere who unfortunately cannot be here in person with us But he was really he really wanted to be part of his celebration. So he sent me a Small person a small message that I want to share. I'm gonna read it on behalf of Yves, okay So it's three days at Eckhart Hall by Yves Meyere So if Eckhart Hall is in University of Chicago, so in November in 86 I was invited to give a talk at the University of Chicago And it was at the time when Stefan was writing his PhD at the Department of Computer Science in Penn University of Pennsylvania Stefan was very eager to talk with me and of course when you can then give your version I hope that everything aligns Stefan was eager to talk with me and we may I get Eckhart Hall Eckhart Hall So Stefan was there with very breaking and important news So he had discovered that signal and image processing with an or orthonormal wavelets It's identical. In fact the same thing as signal or image processing with quadrature mirror filters So these filters came from the community of electrical engineering and we're already being studied in some previous works Stefan was 24 years old when he really made this important bridge between mathematics and electrical engineering And so we had three days of intense and joyful work in professor Ziegmund's office So Ziegmund was still alive, but he let us freely use his office. I Cannot imagine this three days So my only contribution is again from Eve is to this discussion was to warn Stefan That the iterative procedure yielding wavelets could diverge when applied to some bad quadrature mirror filters I was unable to characterize the good quadrature mirror filters that yield smooth wavelets but this was Understood a few years by Albert coin who is here in the room and Ingrid Dobie. She a few years later On February 87 Ingrid achieved her splendid construction of orthonormal basis of completely supported wavelets Okay, and then the last anecdote is as in Europe in Chicago that Chicago has a fantastic art Institute So Eve was urging Stefan that he should visit the art Institute, but we never had the time so thanks Stefan for these three extraordinary days and Well, I guess we can also thank if mayor remotely for these very nice words You know you arrive as a young student and you see this person please an amazing Mathematician I was one out of three hundred in this course in polytechnic, and he was the absolute and then you arrive and The guy that takes you seriously not only that But he was incredibly Welcoming accepting completely different ideas and That's what made me wanting to do research And so sometimes you meet people like that who have this generosity who gives you that and As you go with it, that's your work. I mean the proof he had all the techniques I mean I was coming out and not really I was doing a trick engineering was this other Incredible person who is a who's a nabaiji, but I think that's one of the very wonderful thing we have This field I met number of people like that Alex cross man If may have and I think that's the tradition we need to keep and I Feel incredibly lucky to have met people