296 reputation
210
bio website none
location Germany
age 30
visits member for 3 years, 7 months
seen Jul 30 at 15:02

Jul
30
comment Is this modified coffee cup equivalent to some n-fold torus?
Can you make a picture of it for us non mathematicians? This question makes me want to make the donut to complement the mug, but I don't know what a three-fold torus looks like. Is it a normal 3d structure, can it be made from dough?
Jun
15
comment 'Obvious' theorems that are actually false
@Joshua I have to yet meet a student who notices that this is the root of the problem, and explain how to avoid it in the logical "proof". You are right, of course, once we define the set of "everybody" not as "all humans" but "all humans who are capable of loving my baby", and decide that my baby is not in the set, the result is different.
Jun
13
answered 'Obvious' theorems that are actually false
Jun
13
comment 'Obvious' theorems that are actually false
Good luck finding a layman whose eyes don't glaze at the term "propositional calculus", let alone one who finds something here obvious.
May
21
awarded  Nice Answer
May
14
answered Gift advice: present for high school graduate interested in math
Mar
18
comment Is Lewis Carroll's reasoning correct?
After reading this question, I have to fight the urge to put two black backgammon stones in a bag.
Mar
9
awarded  Notable Question
Mar
4
asked How to recognize if an algorithm working on ordinal data will also work if the ordering is reversed?
Mar
4
comment Can I use the “Secretary Problem” to find the worst candidate, too?
@JørgenFogh Interesting thought. Can you give examples which use ordinal (not interval/ratio) data which won't work? Or are interval/ratio algorithms the exceptions you were referring to? ACtually, I think maybe I should ask this in its own question.
Jan
28
comment Why is it trivial that $\left(1+\frac{2\ln3}{3}\right)^{-3/2}\leq\frac{2}{3}$?
+1. "Trivial" does not mean "obvious" or "quickly proven". It means that, whatever amount of work is needed for the proof, it is uninteresting grunt work. Of course, being obvious makes a proof also trivial, but people forget that not everything trivial is also obvious.
Jan
24
comment Is computer science a branch of mathematics?
As a computer scientist writing a Ph.D. on Requirements Engineering, I could argue that computer science is in fact a branch of social sciences, not mathematics :P
Jan
9
awarded  Nice Answer
Jan
8
awarded  Yearling
Jan
7
revised Pedagogy: How to cure students of the “law of universal linearity”?
added another example in a footnote
Jan
7
revised Pedagogy: How to cure students of the “law of universal linearity”?
Described the role of mental models
Jan
7
awarded  Teacher
Jan
7
revised Pedagogy: How to cure students of the “law of universal linearity”?
added a longer explanation on the way knowing and logic are connected
Jan
7
answered Pedagogy: How to cure students of the “law of universal linearity”?
Jan
7
comment Pedagogy: How to cure students of the “law of universal linearity”?
This is a great question, refutation of such a law is needed in so many more areas other than math. On Cooking.Stackexchange, we have to explain at least once a week that bacterial growth is not linear, so keeping your food at almost fridge temperature doesn't mean that it will be safe as if you had kept it in the fridge... but the next question will again assume that it is true. Or even worse, the next answer.