Question

Univalent(one-one) on each circle implies univalent on disc?

score 65 · Answer 1 · 2023-04-30 16:33:16

65

Views

Univalent(one-one) on each circle implies univalent on disc?

Published on 30 Apr 2023 - 16:33

score 49 · Answer 2 · 2023-05-04 20:16:31

49

Views

Give an example of a group $G$ and subgroups $H$ and $K$ such that $HK=\{hk\mid h\in H,k\in K\}$ is not a subgroup of $G.$

Published on 04 May 2023 - 20:16

score 113 · Answer 3 · 2023-05-04 22:16:31

113

Views

Is $\{x \in \mathbb{Z} \mid x = 6a + 4 \}$ a subset of $\{y \in \mathbb{Z} \mid y = 18b - 2\}$?

Published on 04 May 2023 - 22:16

score 114 · Answer 4 · 2026-04-02 08:20:49

114

Views

Weakly Saturated model not Saturated

Published on 02 Apr 2026 - 8:20

score 89 · Answer 5 · 2026-03-26 16:06:47

89

Views

Non-cancellative commutative monoids in which no element absorbs another

Published on 26 Mar 2026 - 16:06

score 99 · Answer 6 · 2023-05-05 18:45:51

99

Views

Examples of filters over the natural numbers

Published on 05 May 2023 - 18:45

score 89 · Answer 7 · 2026-03-22 06:46:48

89

Views

Bounding boxes of subcontinua

Published on 22 Mar 2026 - 6:46

score 22 · Answer 8 · 2023-05-08 02:11:07

22

Views

Intersection of two balls in a Hilbert space

Published on 08 May 2023 - 2:11

score 173 · Answer 9 · 2023-05-08 15:02:37

173

Views

Does a filtration of the irrational numbers become somewhere dense?

Published on 08 May 2023 - 15:02

score 105 · Answer 10 · 2026-03-26 17:37:35

105

Views

Show that $A\star B=\{ab:(a,b)\in A\times B\}$ in $\mathcal P(X)$ is associative or commutative iff $$ in $X$ is it.

Published on 26 Mar 2026 - 17:37

score 426 · Answer 11 · 2026-03-29 12:57:22

426

Views

If each subring of the fraction field of an integral domain $\mathcal{R}$ (and properly containing $\mathcal{R}$) is a PID, is $\mathcal{R}$ a PID?

Published on 29 Mar 2026 - 12:57

score 32 · Answer 12 · 2023-05-10 02:05:19

32

Views

If $f,g: M \longrightarrow M$ are $R$ module homomorphisms, then $f \circ g \equiv 0 \iff g \circ f \equiv 0$?

Published on 10 May 2023 - 2:05

score 28 · Answer 13 · 2023-05-10 11:57:16

28

Views

Counterexample:If the second-order Taylor polynomial of f at $\textbf{a}$ is f, then the third-order Taylor polynomial of f at $\textbf{a}$ is also f.

Published on 10 May 2023 - 11:57

score 253 · Answer 14 · 2026-03-28 11:42:54

253

Views

A strictly monotone, continuous path with maximal length

Published on 28 Mar 2026 - 11:42

score 227 · Answer 15 · 2026-03-30 16:06:16

227

Views

Prove or disprove that if $|a_{n+1}-a_n|<1/n$ then ${a_n }$ is Cauchy

Published on 30 Mar 2026 - 16:06

List Question

Univalent(one-one) on each circle implies univalent on disc?

Give an example of a group $G$ and subgroups $H$ and $K$ such that $HK=\{hk\mid h\in H,k\in K\}$ is not a subgroup of $G.$

Is $\{x \in \mathbb{Z} \mid x = 6a + 4 \}$ a subset of $\{y \in \mathbb{Z} \mid y = 18b - 2\}$?

Weakly Saturated model not Saturated

Non-cancellative commutative monoids in which no element absorbs another

Examples of filters over the natural numbers

Bounding boxes of subcontinua

Intersection of two balls in a Hilbert space

Does a filtration of the irrational numbers become somewhere dense?

Show that $A\star B=\{ab:(a,b)\in A\times B\}$ in $\mathcal P(X)$ is associative or commutative iff $$ in $X$ is it.

If each subring of the fraction field of an integral domain $\mathcal{R}$ (and properly containing $\mathcal{R}$) is a PID, is $\mathcal{R}$ a PID?

If $f,g: M \longrightarrow M$ are $R$ module homomorphisms, then $f \circ g \equiv 0 \iff g \circ f \equiv 0$?

Counterexample:If the second-order Taylor polynomial of f at $\textbf{a}$ is f, then the third-order Taylor polynomial of f at $\textbf{a}$ is also f.

A strictly monotone, continuous path with maximal length

Prove or disprove that if $|a_{n+1}-a_n|<1/n$ then ${a_n }$ is Cauchy

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