Question

Determine the elements of the set $\{ n \in \mathbb{N} :( \exists x,y \in \mathbb{N} )(n = 2x+3y) \}.$

score 28 · Answer 1 · 2026-03-25 11:14:59

28

Views

Determine the elements of the set $\{ n \in \mathbb{N} :( \exists x,y \in \mathbb{N} )(n = 2x+3y) \}.$

Published on 25 Mar 2026 - 11:14

score 499 · Answer 2 · 2026-03-26 17:46:02

499

Views

Why is the proof of "countable many product of countable sets is countable" wrong?

Published on 26 Mar 2026 - 17:46

score 27 · Answer 3 · 2018-10-10 15:47:46

27

Views

Mathematical induction: $p ∧(q_1 ∨ \cdots∨q_n) = (p∧q_1)∨\cdots∨(p∧q_n)$

Published on 10 Oct 2018 - 15:47

score 290 · Answer 4 · 2018-10-10 23:03:26

290

Views

How can I prove by induction that $n^2+n+3$ is always odd?

Published on 10 Oct 2018 - 23:03

score 25 · Answer 5 · 2018-10-10 23:25:05

25

Views

recursive induction regarding two recursive functions

Published on 10 Oct 2018 - 23:25

score 19 · Answer 6 · 2018-10-11 00:40:10

19

Views

recurrence induction finding a c and d to make it work $f(n) = c4^n - d2^n$

Published on 11 Oct 2018 - 0:40

score 1.2k · Answer 7 · 2026-03-25 22:05:21

1.2k

Views

Prove $F_{n+1} ≤ (\frac74)^n $, where $F_n$ are Fibonacci numbers

Published on 25 Mar 2026 - 22:05

score 111 · Answer 8 · 2018-10-11 14:11:55

111

Views

show that $\frac{1}{3n+1}+\frac{1}{3n+2}+...+\frac{1}{5n}+\frac{1}{5n+1} < \frac{2}{3}$ , $\forall n \mathbb \in{N}$

Published on 11 Oct 2018 - 14:11

score 78 · Answer 9 · 2026-03-25 19:03:01

78

Views

Prove by induction that $W_n = F_{2n+2}$

Published on 25 Mar 2026 - 19:03

score 83 · Answer 10 · 2026-03-27 20:31:41

83

Views

Prove by induction... With exponent and factorial

Published on 27 Mar 2026 - 20:31

score 483 · Answer 11 · 2018-10-12 02:11:32

483

Views

Recursive program correctness proof of a simple python program that returns (x + y).

Published on 12 Oct 2018 - 2:11

score 739 · Answer 12 · 2026-03-26 04:50:06

739

Views

Proving recursive inequality with strong induction

Published on 26 Mar 2026 - 4:50

score 106 · Answer 13 · 2026-03-25 12:53:28

106

Views

What's wrong with this induction? (Runtime analysis of standard polynomial long division)

Published on 25 Mar 2026 - 12:53

score 188 · Answer 14 · 2026-03-25 23:16:18

188

Views

Divisibility Proof $8^n\mid(4n)!$

Published on 25 Mar 2026 - 23:16

score 46 · Answer 15 · 2018-10-13 05:06:48

46

Views

Induction Proof ${n}\geq 3, (1+\frac{1}{n})^{n}\lt n$

Published on 13 Oct 2018 - 5:06

List Question

Determine the elements of the set $\{ n \in \mathbb{N} :( \exists x,y \in \mathbb{N} )(n = 2x+3y) \}.$

Why is the proof of "countable many product of countable sets is countable" wrong?

Mathematical induction: $p ∧(q_1 ∨ \cdots∨q_n) = (p∧q_1)∨\cdots∨(p∧q_n)$

How can I prove by induction that $n^2+n+3$ is always odd?

recursive induction regarding two recursive functions

recurrence induction finding a c and d to make it work $f(n) = c4^n - d2^n$

Prove $F_{n+1} ≤ (\frac74)^n $, where $F_n$ are Fibonacci numbers

show that $\frac{1}{3n+1}+\frac{1}{3n+2}+...+\frac{1}{5n}+\frac{1}{5n+1} < \frac{2}{3}$ , $\forall n \mathbb \in{N}$

Prove by induction that $W_n = F_{2n+2}$

Prove by induction... With exponent and factorial

Recursive program correctness proof of a simple python program that returns (x + y).

Proving recursive inequality with strong induction

What's wrong with this induction? (Runtime analysis of standard polynomial long division)

Divisibility Proof $8^n\mid(4n)!$

Induction Proof ${n}\geq 3, (1+\frac{1}{n})^{n}\lt n$

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