Question

Converting recurrence relation to summation

score 78 · Answer 1 · 2018-08-20 12:21:18

78

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Converting recurrence relation to summation

Published on 20 Aug 2018 - 12:21

score 1.7k · Answer 2 · 2018-08-20 14:20:37

1.7k

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Let S be a set of six positive integers who maximum is at most 14.

Published on 20 Aug 2018 - 14:20

score 141 · Answer 3 · 2018-08-20 15:37:34

141

Views

Let A be a set if 3 distinct natural numbers, none of which exceeds 18.

Published on 20 Aug 2018 - 15:37

score 99 · Answer 4 · 2018-08-21 01:14:12

99

Views

Combinatorial proof for the following fact: $\binom{2n}{n+1}+2\binom{2n}{n}+\binom{2n}{n-1}=\binom{2n+2}{n+1}$

Published on 21 Aug 2018 - 1:14

score 338 · Answer 5 · 2018-08-21 02:19:02

338

Views

Optimization for a sum of submodular functions

Published on 21 Aug 2018 - 2:19

score 1k · Answer 6 · 2026-03-30 19:56:10

1k

Views

generating all possible k partition of an array

Published on 30 Mar 2026 - 19:56

score 520 · Answer 7 · 2018-08-21 11:00:10

520

Views

How many nondecreasing functions $f:\{1,2, \ldots, n\} \to \{1,2, \ldots, n\}$ with $f(i)\leq i$ are there?

Published on 21 Aug 2018 - 11:00

score 74 · Answer 8 · 2026-04-08 06:02:29

74

Views

Is {∅} ⊆ ∅? Set theory

Published on 08 Apr 2026 - 6:02

score 68 · Answer 9 · 2018-08-21 22:16:58

68

Views

How to correctly express a variable with two solutions?

Published on 21 Aug 2018 - 22:16

score 77 · Answer 10 · 2026-03-30 00:22:58

77

Views

Sum of Distinct Positive Integers Different from Sum of Any Combination of The Same Integers

Published on 30 Mar 2026 - 0:22

score 82 · Answer 11 · 2026-03-31 04:10:49

82

Views

How many numbers of 7 digits greater than 3500000 can be formed using the digits 1, 2, 2, 3, 3, 3, 7?

Published on 31 Mar 2026 - 4:10

score 58 · Answer 12 · 2018-08-22 08:06:15

58

Views

How would I go about answering this question about functions?

Published on 22 Aug 2018 - 8:06

score 1.1k · Answer 13 · 2018-08-22 08:25:58

1.1k

Views

How many ways are there to choose from a deck of cards?

Published on 22 Aug 2018 - 8:25

score 137 · Answer 14 · 2026-03-31 23:55:51

137

Views

If $g$ solves $\sum\limits_{d|n}g(d) = \log n$, then $g(p^e)=\log p$ for every prime $p$ and integer $e$, and $g(n)=0$ otherwise

Published on 31 Mar 2026 - 23:55

score 224 · Answer 15 · 2026-04-01 14:25:37

In a group of $n$ people everybody with a mutual friend know different number of people. Do there exist somebody knowing only one person?

List Question

Converting recurrence relation to summation

Let S be a set of six positive integers who maximum is at most 14.

Let A be a set if 3 distinct natural numbers, none of which exceeds 18.

Combinatorial proof for the following fact: $\binom{2n}{n+1}+2\binom{2n}{n}+\binom{2n}{n-1}=\binom{2n+2}{n+1}$

Optimization for a sum of submodular functions

generating all possible k partition of an array

How many nondecreasing functions $f:\{1,2, \ldots, n\} \to \{1,2, \ldots, n\}$ with $f(i)\leq i$ are there?

Is {∅} ⊆ ∅? Set theory

How to correctly express a variable with two solutions?

Sum of Distinct Positive Integers Different from Sum of Any Combination of The Same Integers

How many numbers of 7 digits greater than 3500000 can be formed using the digits 1, 2, 2, 3, 3, 3, 7?

How would I go about answering this question about functions?

How many ways are there to choose from a deck of cards?

If $g$ solves $\sum\limits_{d|n}g(d) = \log n$, then $g(p^e)=\log p$ for every prime $p$ and integer $e$, and $g(n)=0$ otherwise

In a group of $n$ people everybody with a mutual friend know different number of people. Do there exist somebody knowing only one person?

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