1,005 reputation
915
bio website thomas-kahle.de
location Magdeburg, Germany
age 33
visits member for 5 years, 1 month
seen 14 hours ago

I'm working in Magdeburg, Germany.


14h
awarded  Yearling
May
20
revised Formulating conditional constraints in optimization
Reformulate so that the problem has a chance to be accepted.
May
20
comment Formulating conditional constraints in optimization
Welcome to mathoverflow, by the way. Please make sure to proofread your question, use math environments, and formulate it so that it is enticing for research mathematicians.
May
20
suggested approved edit on Formulating conditional constraints in optimization
Aug
5
comment Software tools for medium-scale systems of polynomial equations
Oh, sorry. I did not see that you worked with the actual problem (because I did not see that it was linked). I was wondering where you numbers came from... :)
Aug
5
comment Software tools for medium-scale systems of polynomial equations
In this case it looks like it will use a general SQP approach, then. I somehow doubt that it will take only a few seconds to find a reasonable approximation to a global minimum of a long sum of squares in 12 variables, but I have not used Maple in a couple of years...
Aug
5
revised Software tools for medium-scale systems of polynomial equations
slight extension to highlight difference between solving and SDP.
Aug
5
comment Software tools for medium-scale systems of polynomial equations
What is Maple doing internally? For an arbitrary function, random search for a minimum is as good as any other method, so is it using random search?
Aug
3
answered Software tools for medium-scale systems of polynomial equations
Jul
2
awarded  Curious
Apr
20
awarded  Yearling
Apr
15
comment Variety of commutative semi group
@J.-E.Pin You are right, I have no idea what the difference between an identity and a relation may be in the context here.
Apr
15
comment Variety of commutative semi group
Judging from the result that you expect, I'm suspecting that you are after the variety of a commutative semigroup ring? Maybe one that satisfies $x_i^2 = x_i^3$ for each indeterminate $x_i$? Please rework this questions, at the moment it makes no sense.
Apr
6
awarded  Popular Question
Oct
7
awarded  Constituent
Sep
30
awarded  Caucus
Sep
28
awarded  Informed
Sep
28
revised vertex independent set and the maximal clique
formatting
Sep
28
suggested approved edit on vertex independent set and the maximal clique
Sep
28
comment How do you not forget old math?
I agree, and you explained it better than I did.