User Jukka Kohonen

11 votes

Estimating the value of $e$ using a random function

answered Sep 8, 2021 at 13:34

9 votes

Accepted

A general "inclusion-exclusion principle" / Formulas like $\inf(a,b)\sup(a,b)=ab$

answered Aug 26, 2021 at 14:32

8 votes

Accepted

How many $5$-digit numbers are there with digits $abcde$ such that $a < b < c \leq d \leq e$?

answered Aug 18, 2021 at 18:35

6 votes

Can you provide a symmetric presentation of this partition lattice?

answered Aug 30, 2021 at 5:51

6 votes

Finding the probability that at least 8 houses in a row are of same colour.

answered Sep 11, 2021 at 14:32

6 votes

Recurrence on partial orders

answered Sep 13, 2021 at 9:50

6 votes

Accepted

Xor of two binary random variables

answered Sep 27, 2021 at 7:00

5 votes

Accepted

Finding a closed form for constant

answered Oct 1, 2021 at 18:11

5 votes

Accepted

A set with volume zero can be covered by finitely many open boxes

answered Sep 12, 2021 at 11:22

5 votes

Prove that for one vertex of a convex pentagon, the sum of distances to the other four is greater than the perimeter

answered Sep 15, 2021 at 8:39

5 votes

Suppose we have $N$ people. A random selection of $k$ of these people meet each day. What is the expected number of days until everyone has met?

answered Sep 2, 2021 at 16:59

5 votes

Accepted

Is there a polytope with face poset given by the lattice of (unordered) partitions?

answered Sep 8, 2021 at 7:06

4 votes

Accepted

What is the smallest poset with automorphism group $C_n$?

answered Aug 17, 2021 at 5:07

3 votes

Accepted

Summation notation for two conditions

answered Aug 12, 2021 at 15:35

3 votes

Sawtooth-like polygonal chains in $\mathbb R^2$ must self-intersect.

answered Aug 27, 2021 at 19:54

3 votes

An estimate on the volume of the unit ball

answered Aug 29, 2021 at 6:29

3 votes

Accepted

Devising an algorithm to get $A_n$ in a series within $\log n$ operations

answered Sep 6, 2021 at 23:04

3 votes

Accepted

Transformations that preserve beta random variables

answered Sep 20, 2021 at 7:37

3 votes

Accepted

On counting transitive relations

answered Sep 17, 2021 at 7:26

3 votes

Accepted

Why is the approximation symbol used in universal algebra?

answered Sep 27, 2021 at 7:16

2 votes

Accepted

Sample variance equation not producing right estimate of population variance?

answered Sep 28, 2021 at 4:39

2 votes

Accepted

Maximum size of antichain-like collection

answered Sep 28, 2021 at 17:19

2 votes

Accepted

MATLAB exercise for average of dot products of unit vectors not matching textbook's calculus result.

answered Sep 28, 2021 at 18:43

2 votes

Is there a better lower bound on $|P_n|$, the number of posets on a set

answered Sep 19, 2021 at 17:32

2 votes

Accepted

Expected length of a stochastic process

answered Oct 2, 2021 at 1:43

2 votes

Accepted

Polya Enumeration: Generate Configurations off of Cycle Index

answered Sep 17, 2021 at 6:56

2 votes

Accepted

Lower bound for the number of partial orders

answered Sep 13, 2021 at 8:40

2 votes

Derivative of conditional probability on condition

answered Sep 16, 2021 at 22:15

2 votes

Accepted

Is this identity known and if so, does it have a name?

answered Sep 16, 2021 at 0:00

2 votes

Accepted

Is there a way to find $P(A | B, C)$ if I know $P(A|B) , P(A|C)$ and I also know that $B, C$ are independent

answered Sep 16, 2021 at 17:16

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69 Answers

Estimating the value of $e$ using a random function

A general "inclusion-exclusion principle" / Formulas like $\inf(a,b)\sup(a,b)=ab$

How many $5$-digit numbers are there with digits $abcde$ such that $a < b < c \leq d \leq e$?

Can you provide a symmetric presentation of this partition lattice?

Finding the probability that at least 8 houses in a row are of same colour.

Recurrence on partial orders

Xor of two binary random variables

Finding a closed form for constant

A set with volume zero can be covered by finitely many open boxes

Prove that for one vertex of a convex pentagon, the sum of distances to the other four is greater than the perimeter

Suppose we have $N$ people. A random selection of $k$ of these people meet each day. What is the expected number of days until everyone has met?

Is there a polytope with face poset given by the lattice of (unordered) partitions?

What is the smallest poset with automorphism group $C_n$?

Summation notation for two conditions

Sawtooth-like polygonal chains in $\mathbb R^2$ must self-intersect.

An estimate on the volume of the unit ball

Devising an algorithm to get $A_n$ in a series within $\log n$ operations

Transformations that preserve beta random variables

On counting transitive relations

Why is the approximation symbol used in universal algebra?

Sample variance equation not producing right estimate of population variance?

Maximum size of antichain-like collection

MATLAB exercise for average of dot products of unit vectors not matching textbook's calculus result.

Is there a better lower bound on $|P_n|$, the number of posets on a set

Expected length of a stochastic process

Polya Enumeration: Generate Configurations off of Cycle Index

Lower bound for the number of partial orders

Derivative of conditional probability on condition

Is this identity known and if so, does it have a name?

Is there a way to find $P(A | B, C)$ if I know $P(A|B) , P(A|C)$ and I also know that $B, C$ are independent