My past research interests included differential algebraic equations, nonlinear analysis and relations between symmetries and structural properties.

I recently investigated hierarchical structures, starting from group cohomology, continuing with semi-group theory and ending with lattices and universal algebra.

20h
awarded Constituent
2d
awarded Custodian
2d
reviewed Reopen Open Standard Prolog Knowledge Bases
Dec
16
accepted Are the mass and charge important for the path of a charged particle in an electric potential?
Dec
16
reviewed Reviewed How should people who don't follow the "golden rule" be treated?
Dec
16
reviewed Leave Open Why do we do what a police officer tells us to do?
Dec
16
reviewed Close Can deontic conditionals be indicative?
Dec
16
reviewed Close What are the differences between the process of dying, the event of death, and the state of being dead?
Dec
16
reviewed Close Are there any significant passages in Plato's great work, the "Republic"?
Dec
16
reviewed No Action Needed The "point" to an Atheists existence
Dec
16
reviewed Reviewed The "point" to an Atheists existence
Dec
16
comment My thoughts on time
This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient reputation you will be able to comment on any post.
Dec
16
reviewed Looks Good Is it ok to exterminate species if it is 'invasive'?
Dec
16
reviewed Close Middle finger and it's curse
Dec
16
comment Natural candidates for the hierarchy inside NPI
OK, I have read the beginning of the reference now. The ring is given by addition/mult tables, but these have a canonical compressed representation for rings (because the additive group is Abelian), so the GI-completeness result for finite structures is not relevant. I wouldn't characterize this representation as "gens and relations", because that sounds like the "silent mixing" about which I initially complained. Unrelated remark: I neither referred to the parenthetical paragraph, nor assumed that ring isomorphism should be GI-complete, just that it should not be harder than GI.
Dec
15
comment Natural candidates for the hierarchy inside NPI
I find the silent mixing of counting versions and decision versions quite confusing. A ring is a finite structure, and the (decision version of) isomorphism of finite structures is GI-complete. So the decision version of ring isomorphism is neither harder than GI nor harder than integer factoring.
Dec
15
awarded Enthusiast
Dec
15
revised Are the mass and charge important for the path of a charged particle in an electric potential?
Added the actual equations solved by the code, or maybe just equations which come close to what the code does.
Dec
12
comment How much can investigating three nested systems help interpreting probabilistic theories?
But if I have to predict the whether for tomorrow, then the frequentist interpretation is no longer helpful, because this experiment can neither be controlled, nor repeated. Hence I need a different interpretation of probability for that case.
Dec
12
comment How much can investigating three nested systems help interpreting probabilistic theories?
@vzn For the process of scientific measurements, I actually prefer the frequentist interpretation. It should be applicable to this case, and it is much easier for me to understand than any of the other interpretations of probability.
1 2 3 4 5