473 reputation
215
bio website
location Germany
age 48
visits member for 4 years
seen Nov 14 at 0:00

My interests:

  • abstract structures
    (e.g. graphs, groups, polytopes, spaces, ...)

    in the course of this

  • category theory

  • model theory

  • presentations and representations
    (e.g. of abstract structures by or inside other abstract structures)

    next to this

  • philosophy
    (esp. of mathematics, science, and mind)

    especially concerned with

  • atomism
    (i.e. reductionistic or other theories referring to some kind of "atoms")

  • their refutations


Nov
16
awarded  Popular Question
Nov
13
comment Why does Philae have only three legs?
The harpoon system is somehow clear to me: "inject the harpoon wherever it finds ground and appropriate conditions" - but how does this ominous thruster system work?
Nov
13
comment Why does Philae have only three legs?
Does this mean: the best one can do is to give a lander three legs? (Because we live in three dimensions.) I claim: this is not sooo obvious.
Nov
13
comment Why does Philae have only three legs?
@David: Thanks for your re-(in)queries. Now I see things better.
Nov
13
revised Why does Philae have only three legs?
added 66 characters in body
Nov
13
comment Why does Philae have only three legs?
I DID explain what the orientation of the fourth leg should be: by "(regular) tetrahedron". Foreseen benefit: more stability.
Nov
13
comment Why does Philae have only three legs?
@David: But now one of the three legs rises helplessly into the air. Wouldn't it be better that a fourth leg touches ground? In any case? (Left alone of what you explained - which I hope to have understood.)
Nov
13
comment Why does Philae have only three legs?
@Prahar: haha! See my comment above. (On an irregular surface with low gravitational forces the tripod example doesn't help further.)
Nov
13
revised Why does Philae have only three legs?
added 44 characters in body
Nov
13
comment Why does Philae have only three legs?
We are not talking about something like a plane underground with strong gravitational effects - but about an unpredictabily irregular underground with some soft gravitational effects.
Nov
13
comment Why does Philae have only three legs?
We are not talking about something like a plane underground with strong gravitational effects - but about an unpredictabily irregular underground with some soft gravitational effects.
Nov
13
asked Why does Philae have only three legs?
Oct
12
awarded  Popular Question
Sep
24
awarded  Autobiographer
Jul
2
awarded  Curious
Jun
4
answered Origins of many-particle interactions
May
31
comment Dimension of galaxy filaments
For a generic structure of superclusters I would assume d~3: they are somehow arranged.
May
27
asked Dimension of galaxy filaments
Apr
27
accepted Origins of many-particle interactions
Apr
25
awarded  Benefactor