Question

Counting the 1s in each row of the incidence matrix of a 2-design

score 73 · Answer 1 · 2014-06-02 09:06:04

73

Views

Counting the 1s in each row of the incidence matrix of a 2-design

Published on 02 Jun 2014 - 9:06

score 964 · Answer 2 · 2014-06-09 03:12:18

964

Views

Prove that $\lambda(v-1) = r(k-1)$

Published on 09 Jun 2014 - 3:12

score 99 · Answer 3 · 2014-07-24 07:54:22

99

Views

What is the minimum number of sign patterns in $\frac n2$ of columns (or rows) of Hadamard matrices?

Published on 24 Jul 2014 - 7:54

score 326 · Answer 4 · 2014-08-13 19:32:35

326

Views

$24$ people in groups of $3$ where everyone meets exactly once at the end of some number of rounds

Published on 13 Aug 2014 - 19:32

score 33 · Answer 5 · 2014-08-13 22:39:14

33

Views

network design: why can't an almost satisfied proper function violated by all given sets?

Published on 13 Aug 2014 - 22:39

score 295 · Answer 6 · 2014-09-09 00:10:03

295

Views

Diner Combinations, Each Pair Sits Together Exactly Once

Published on 09 Sep 2014 - 0:10

score 191 · Answer 7 · 2026-03-22 03:16:08

191

Views

Terminology - variant of a hypergraph

Published on 22 Mar 2026 - 3:16

score 209 · Answer 8 · 2014-10-06 14:54:18

209

Views

Steiner Triple Systems block clique

Published on 06 Oct 2014 - 14:54

score 53 · Answer 9 · 2014-10-09 04:03:26

53

Views

Proof relating to 2-designs. Show $\lambda \le \dbinom{v-2}{k-2}$.

Published on 09 Oct 2014 - 4:03

score 78 · Answer 10 · 2014-10-18 12:05:23

78

Views

A question involving Partial Steiner Triple Systems

Published on 18 Oct 2014 - 12:05

score 357 · Answer 11 · 2014-10-28 07:19:44

357

Views

Prove Fisher's Inequality for a non-trivial 2 - (v, 4, λ) design

Published on 28 Oct 2014 - 7:19

score 32 · Answer 12 · 2014-11-07 03:02:09

32

Views

Matrix array built from range?

Published on 07 Nov 2014 - 3:02

score 92 · Answer 13 · 2014-11-08 08:39:32

92

Views

Number of blocks in this design $(V,\mathcal{B})$ $|V|=16$ and $\mathcal{B}$ has size $4$

Published on 08 Nov 2014 - 8:39

score 90 · Answer 14 · 2014-11-10 04:34:58

90

Views

Choosing a committee from two people who are not sitting beside each other.

Published on 10 Nov 2014 - 4:34

score 44 · Answer 15 · 2014-11-20 16:39:30

44

Views

Combinatorial designs give triangulations of complete graphs

Published on 20 Nov 2014 - 16:39

List Question

Counting the 1s in each row of the incidence matrix of a 2-design

Prove that $\lambda(v-1) = r(k-1)$

What is the minimum number of sign patterns in $\frac n2$ of columns (or rows) of Hadamard matrices?

$24$ people in groups of $3$ where everyone meets exactly once at the end of some number of rounds

network design: why can't an almost satisfied proper function violated by all given sets?

Diner Combinations, Each Pair Sits Together Exactly Once

Terminology - variant of a hypergraph

Steiner Triple Systems block clique

Proof relating to 2-designs. Show $\lambda \le \dbinom{v-2}{k-2}$.

A question involving Partial Steiner Triple Systems

Prove Fisher's Inequality for a non-trivial 2 - (v, 4, λ) design

Matrix array built from range?

Number of blocks in this design $(V,\mathcal{B})$ $|V|=16$ and $\mathcal{B}$ has size $4$

Choosing a committee from two people who are not sitting beside each other.

Combinatorial designs give triangulations of complete graphs

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