Question

Is every bounded subposet of a lattice, a lattice?

score 133 · Answer 1 · 2026-03-24 23:46:18

133

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Is every bounded subposet of a lattice, a lattice?

Published on 24 Mar 2026 - 23:46

score 451 · Answer 2 · 2026-04-01 22:38:28

451

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Question in proving a recurrence relation for Catalan numbers

Published on 01 Apr 2026 - 22:38

score 297 · Answer 3 · 2026-03-25 23:50:55

297

Views

Get the probability, with Pascal's triangle.

Published on 25 Mar 2026 - 23:50

score 43 · Answer 4 · 2018-04-04 02:32:37

43

Views

How to get a closed form for $\sum m f(n,m)$ where $f(n,m)$ is number of weak compositions?

Published on 04 Apr 2018 - 2:32

score 322 · Answer 5 · 2026-03-31 02:42:30

322

Views

Combinatorial proof for this stirling number of second kind

Published on 31 Mar 2026 - 2:42

score 1.1k · Answer 6 · 2026-03-26 06:21:08

1.1k

Views

How many ways are there to arrange 4 letters from the word PROGRAM?

Published on 26 Mar 2026 - 6:21

score 75 · Answer 7 · 2018-04-04 11:30:49

75

Views

How many subsets of squares in a $3 \times 3$ grid, corners requiring both adjacent squares to be included?

Published on 04 Apr 2018 - 11:30

score 110 · Answer 8 · 2026-03-26 06:22:20

110

Views

What is the minimum number of passwords needed to guarantee that at least $2$ passwords have their lower case part the same?

Published on 26 Mar 2026 - 6:22

score 196 · Answer 9 · 2018-04-04 14:56:27

196

Views

Combinatoric proof of $\sum_{i=1}^ni(n-i+1)={n+2\choose{3}}.$

Published on 04 Apr 2018 - 14:56

score 1.5k · Answer 10 · 2018-04-04 16:59:08

I have 4 colors of cubes: red, yellow, blue and green. How many variants have I got to build a tower of 6 blocks?

score 356 · Answer 11 · 2026-03-29 11:44:29

356

Views

prove that the product of primes in a given interval is less than or equal to binom

Published on 29 Mar 2026 - 11:44

score 55 · Answer 12 · 2026-04-02 04:58:01

55

Views

Inequality on sums

Published on 02 Apr 2026 - 4:58

score 67 · Answer 13 · 2026-03-26 03:19:02

67

Views

Why does this not hold? (partitioning sets into nonempty subsets)

Published on 26 Mar 2026 - 3:19

score 369 · Answer 14 · 2018-04-04 19:48:13

369

Views

Positive integer solutions to $x_1+...+x_n=k$.

Published on 04 Apr 2018 - 19:48

score 572 · Answer 15 · 2018-04-04 19:54:28

572

Views

What is the number of ordered pairs of unordered pairs of a set $S$ that share one element?

Published on 04 Apr 2018 - 19:54

List Question

Is every bounded subposet of a lattice, a lattice?

Question in proving a recurrence relation for Catalan numbers

Get the probability, with Pascal's triangle.

How to get a closed form for $\sum m f(n,m)$ where $f(n,m)$ is number of weak compositions?

Combinatorial proof for this stirling number of second kind

How many ways are there to arrange 4 letters from the word PROGRAM?

How many subsets of squares in a $3 \times 3$ grid, corners requiring both adjacent squares to be included?

What is the minimum number of passwords needed to guarantee that at least $2$ passwords have their lower case part the same?

Combinatoric proof of $\sum_{i=1}^ni(n-i+1)={n+2\choose{3}}.$

I have 4 colors of cubes: red, yellow, blue and green. How many variants have I got to build a tower of 6 blocks?

prove that the product of primes in a given interval is less than or equal to binom

Inequality on sums

Why does this not hold? (partitioning sets into nonempty subsets)

Positive integer solutions to $x_1+...+x_n=k$.

What is the number of ordered pairs of unordered pairs of a set $S$ that share one element?

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