Hello, Some days ago, I sent a post to the newsgroups sci.math.research and sci.physics.research to ask for information related to the use of category theory for telecommunication engineers. I have been kindly advised to repost the question here. So, here follow a copy of my original post. I thank you in advance if you can help. Regards, Christophe Favergeon ---- Some years ago, I had the good idea to start reading the sci.math.research and the sci.physics.research newsgroups. It allowed me to learn many interesting things and I fell in love with Category theory. I progressively became convinced that Category theory may also be useful to telecommunication engineers (which is my current title) at least to teach new ways to look at the problems. So, I am trying to find ways to familiarize my coworkers (and telecom engineers in general) with Category theory. I have found some examples of use in software engineering, in hardware design, in signal processing (coalgebra for streams). Although I find the examples very interesting, they will probably totally useless to convince a telecom engineer (I am talking of a personal experience : my coworker are generally not very receptive to abstract maths. I hope it is not a general trend among telecom engineers). So, I am asking readers of these newsgroups if they have knowledge of some works related to the use of Category theory in telecom. I am interested in applications to : electromagnetism, software and hardware design, filtering theory, coding theory and digital modulation... Since I already knows some examples in software and hardware design, I would prefer examples, references and ideas in the other domains. (For electromagnetism it could either be about antennas or just electrical networks).