523 reputation
17
bio website
location
age
visits member for 1 year, 8 months
seen 7 hours ago

Jan-Dvorak @ Miaou
Honnza @ gmail.com

"Haven't you heard? Crowdsourcing to stackOverflow is the new trend in basic debugging."

-- Jan Dvorak

"There are only two hard things in Computer Science: cache invalidation, naming things and off-by-one errors"

-- variation of Phil Karlton's quote


2d
comment What does conditional probability $P(A|B)$ mean when $P(B)=0$?
what... are the implications of this that can be understood by intuition?
2d
comment What does conditional probability $P(A|B)$ mean when $P(B)=0$?
I would like $1/0$ to be the positive infinity, or at least a complex one. Now $0/0$ is a problem...
Apr
9
comment What is the shortest way to write the number $1234567890$?
@SanathDevalapurkar forum? Stack Exchange is not a forum.
Apr
7
comment Visually stunning math concepts which are easy to explain
@OmnipotentEntity it doesn't qualify as having fractional dimension because the underlying space is discrete. If you use a real space instead - the set of x, y such that x * y = 0 mod n, you get a set of hyperboles (linear in dimension). If you take a limit towards infinite squares, then the count of white squares is equal to the length of the edge whenever the length is prime.
Mar
2
comment Olympiad Maths Training Question
Closely related: circle packing
Feb
10
comment Simplifying fraction
@ZevChonoles I'm well aware of that fact. I was referring to his previous unsuccessful post there.
Feb
10
comment Simplifying fraction
no success on MathOverflow? Also, I'm still not sure what you're asking.
Feb
9
comment Question about finding the volume of a Sphere to a certain point
hint: what's the area of the slice of constant height? hint: it's a circle, and you can use the pythagorean theorem to get its size. Can you integrate these?
Feb
7
suggested suggested edit on La fonction $f$ admet-elle une fonction réciproque?
Feb
7
suggested suggested edit on La fonction $f$ admet-elle une fonction réciproque?
Feb
7
suggested suggested edit on La fonction $f$ admet-elle une fonction réciproque?
Feb
6
comment La fonction $f$ admet-elle une fonction réciproque?
@imranfat "nous ne parlons pas". "parle" is the singular form.
Feb
6
comment La fonction $f$ admet-elle une fonction réciproque?
English, please
Jan
26
comment Degree of a Vertex Problem
so... showing bipartiteness is easy... Right? And the second property is false.
Jan
24
comment A “Paradoxist Geometry”
@Neil discrete geometry could do. There's discrete projective geometry, but that has no parallels.
Jan
24
comment A “Paradoxist Geometry”
Do you insist on "each pair of lines has at most one intersection"? Because this doesn't apply on a cone.
Jan
20
comment Function is equal to its own derivative
$a e^x$ for every $a$. No other functions.
Jan
11
comment New Fibonacci sequence
There is. I don't want to go looking for it right now, however.
Jan
2
comment Necessary and sufficient condition for an Euler circuit
Hint: the previous hint should be sufficient to answer your question completely.
Jan
2
comment Necessary and sufficient condition for an Euler circuit
hint: every simple graph is a valid multigraph