# Jyrki Lahtonen

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bio website users.utu.fi/lahtonen/… location Rusko, Finland age 50 member for 2 years, 10 months seen Apr 11 at 17:53 profile views 565

# General non-sense:

Mostly I teach here. I want to encourage beginning students to think for themselves, so I use a lot of hints and comments. More advanced questions I often just answer.

However, I don't do 1-on-1 chat. Don't ask. My answers and comments are for all to see, so I don't like to hide them. Also I feel that entering a chatroom carries with it an obligation to continue an on-line discussion, and then I would not be using my time on my own terms.

# Relevant personal history:

PhD from Notre Dame in '90.

Drifted from representation theory of algebraic groups to applications of algebra into telecommunications, mostly coding theory, and lately mostly teaching at college level.

3 graduate students with awarded PhDs

I have mostly worked at our local University at Turku, Finland. At one point I tried working for Nokia Research Center. It was ok, but an old dog didn't learn all the tricks, and then they downsized, so I returned to the Uni as a tenured lecturer.

 8 Reed-Muller-Codes 8 Hot-topics in error correcting coding related to interesting math. ? 5 A combinatorial question 5 What is matrix A such that Hamming weight of [x, Ax] is maximal ? (Min distance of 1/2 block code?) 5 Good codes in practice for correcting combination of errors and erasures

# 831 Reputation

 +10 Stochastic process with Bessel function autocorrelation. (Rayleigh (Jakes) fading for radiowave propagation) +20 Good codes in practice for correcting combination of errors and erasures +20 What is matrix A such that Hamming weight of [x, Ax] is maximal ? (Min distance of 1/2 block code?) +10 Reducible trinomials $x^{odd}+x^2+s(t)$ in characteristic $2$

# 29 Tags

 38 coding-theory × 15 6 co.combinatorics × 3 25 it.information-theory × 9 5 matrices 7 finite-fields × 4 2 rt.representation-theory 7 polynomials × 3 2 orthogonal-polynomials 7 reference-request × 2 2 gr.group-theory

# 11 Accounts

 Mathematics 46,345 rep 359132 MathOverflow 831 rep 26 Mathematics Educators 468 rep 12 TeX - LaTeX 192 rep 8 Mathematica 180 rep 7