Mathematics
Meta user
Network profile
78,845
reputation
5
24
70

Lutz Lehmann

Lutz Lehmann, Dr. math., living in Berlin, Germany

I once was interested in discrete orthogonal wavelet transforms, constructing examples of symmetric 4-channel transforms and more exotic variants in 3, 5, 7, 8 channels using algebraic geometry with an elimination type algorithm (Kronecker in CAS Magma, research group OpTERA).

Nowadays my interest is in numerical algorithms, specifically for differential equations, the history of mathematics and science.

4,115
answers
0
questions
~1.1m
people reached

Communities (12)

Top network posts

Top tags (530)

Score 2,079
Posts 1,895
Posts % 46
Score 1,122
Posts 998
Score 806
Posts 555
Score 709
Posts 497
Score 252
Posts 185
Score 228
Posts 174
View all tags →

Top posts (4,115) All Questions Answers | Votes Newest

26 Can an infinite sum of irrational numbers be rational? Feb 9 '16
21 Showing that the exponential expression $e^x (x-1) + 1$ is positive Feb 24 '16
20 Math Olympiad Algebra Question Jun 5 '14
16 How To Solve a Trigonometric Differential Equation Dec 23 '18
15 Can the integral of a function be larger than function itself? Jan 7 '17
14 Partial Fractions: Why does this shortcut method work? Aug 3 '19
14 Differential Equation : One question, two methods, both result in different answers May 15 '17
13 Hint needed to figure out sum of the series $x + \frac{x^3}{1\cdot 3} + \frac{x^5}{1\cdot 3\cdot 5}+…$ Jan 11 '17
12 Determining if a differential equation has unique solution Nov 6 '18
12 How to prove that $\det(A)$ can be expressed as a $n \times n$ determinant with entries $\operatorname{tr}(A^k)$ Jan 1 '14
View all questions and answers →

Badges (99)

Gold

5

Rarest

Silver

24

Rarest

Bronze

70

Rarest

View all badges →