Question

Counterexample for the following statement

score 172 · Answer 1 · 2026-04-11 14:18:16

172

Views

Counterexample for the following statement

Published on 11 Apr 2026 - 14:18

score 81 · Answer 2 · 2026-04-08 21:48:52

81

Views

Is my proof correct? (function composition, surjectivity)

Published on 08 Apr 2026 - 21:48

score 2.4k · Answer 3 · 2026-04-09 05:09:26

2.4k

Views

Another proof that dividing by $0$ does not exist -- is it right?

Published on 09 Apr 2026 - 5:09

score 205 · Answer 4 · 2026-04-30 01:09:13

205

Views

How to prove that $\mathbb{Z} \sim E^$ where $E^$ is the set of positive even integers

Published on 30 Apr 2026 - 1:09

score 756 · Answer 5 · 2026-04-16 00:42:34

756

Views

Checking/Verifying Proof for all $a,\,b\in N$, $a|b$ if and only if $bZ\subseteq aZ$

Published on 16 Apr 2026 - 0:42

score 281 · Answer 6 · 2026-04-13 15:35:34

281

Views

$8$ billion people in the world, increase each year by $2\%$, how many people will be in $9$ months?

Published on 13 Apr 2026 - 15:35

score 243 · Answer 7 · 2026-04-15 14:44:44

243

Views

Show that $\lim_{n}\sum_{k=n}^{2n}{1\over k} = \ln2$ using elementary methods.

Published on 15 Apr 2026 - 14:44

score 71 · Answer 8 · 2026-04-13 19:50:53

10 million people, population decreases by 2 percent a year, country accepts A people find A such that the population in the country increases.

score 80 · Answer 9 · 2026-04-10 14:07:56

80

Views

Verifying theorem proofs derived from definition of homomorphism between structures

Published on 10 Apr 2026 - 14:07

score 74 · Answer 10 · 2026-04-15 17:26:32

74

Views

When the ring of fractions of $R$ with respect to any maximal ideal $M$ of $R$ is a field

Published on 15 Apr 2026 - 17:26

score 430 · Answer 11 · 2026-04-11 16:33:59

430

Views

Confirm a Metric on the set of Continuous function on [0,1]

Published on 11 Apr 2026 - 16:33

score 40 · Answer 12 · 2026-04-09 04:37:14

40

Views

Problem in proof of alternating series test?

Published on 09 Apr 2026 - 4:37

score 68 · Answer 13 · 2026-04-16 14:48:48

68

Views

Give an example of function that satisfies this theorem?

Published on 16 Apr 2026 - 14:48

score 70 · Answer 14 · 2026-04-14 06:41:26

70

Views

Proving a normed space is complete with directly using a Cauchy sequence.

Published on 14 Apr 2026 - 6:41

score 64 · Answer 15 · 2026-04-30 02:05:26

64

Views

If $ |A| = n $ and $ |B| = m $, then there exists a bijection $f: I_{n + m} \rightarrow A \cup B $

Published on 30 Apr 2026 - 2:05

List Question

Counterexample for the following statement

Is my proof correct? (function composition, surjectivity)

Another proof that dividing by $0$ does not exist -- is it right?

How to prove that $\mathbb{Z} \sim E^$ where $E^$ is the set of positive even integers

Checking/Verifying Proof for all $a,\,b\in N$, $a|b$ if and only if $bZ\subseteq aZ$

$8$ billion people in the world, increase each year by $2\%$, how many people will be in $9$ months?

Show that $\lim_{n}\sum_{k=n}^{2n}{1\over k} = \ln2$ using elementary methods.

10 million people, population decreases by 2 percent a year, country accepts A people find A such that the population in the country increases.

Verifying theorem proofs derived from definition of homomorphism between structures

When the ring of fractions of $R$ with respect to any maximal ideal $M$ of $R$ is a field

Confirm a Metric on the set of Continuous function on [0,1]

Problem in proof of alternating series test?

Give an example of function that satisfies this theorem?

Proving a normed space is complete with directly using a Cauchy sequence.

If $ |A| = n $ and $ |B| = m $, then there exists a bijection $f: I_{n + m} \rightarrow A \cup B $

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