Question

Show if $G$ is a planar graph, then $G\setminus e$ is also planar

score 249 · Answer 1 · 2026-03-26 04:52:17

249

Views

Show if $G$ is a planar graph, then $G\setminus e$ is also planar

Published on 26 Mar 2026 - 4:52

score 71 · Answer 2 · 2020-01-23 15:16:40

71

Views

verify the dimension theorem for this function

Published on 23 Jan 2020 - 15:16

score 49 · Answer 3 · 2026-03-28 01:35:30

49

Views

Sturm-Liouville exercise: finding linearly independent solutions

Published on 28 Mar 2026 - 1:35

score 40 · Answer 4 · 2020-01-23 20:38:25

40

Views

Find the number of ways in which $12$ people can be seated at a square table for the following given data.

Published on 23 Jan 2020 - 20:38

score 135 · Answer 5 · 2020-01-23 21:18:24

135

Views

There are $20$ books on Algebra & Calculus in our library. Find the condition of maximum selections each of which consist of $5$ books on each topic.

Published on 23 Jan 2020 - 21:18

score 171 · Answer 6 · 2026-03-27 07:19:51

171

Views

Prove/Disprove $\begin{pmatrix} a & b \\ c & d \end{pmatrix}$ positive/negative definite and indefinite

Published on 27 Mar 2026 - 7:19

score 30 · Answer 7 · 2020-01-23 21:29:03

30

Views

Is this proof of the convergence of two improper integrals correct?

Published on 23 Jan 2020 - 21:29

score 255 · Answer 8 · 2020-01-23 22:45:14

255

Views

On the solvability with radicals of a 4th degree polynomial

Published on 23 Jan 2020 - 22:45

score 52 · Answer 9 · 2020-01-23 22:46:06

52

Views

Proving $(A \times C) \cup (B \times D) \subset (A \cup B) \times (C \cup D)$

Published on 23 Jan 2020 - 22:46

score 1.1k · Answer 10 · 2020-01-23 23:07:41

1.1k

Views

For finite $S$, if $f:S\rightarrow S$ is surjective, then $f$ is injective.

Published on 23 Jan 2020 - 23:07

score 202 · Answer 11 · 2020-01-24 03:27:42

202

Views

(Help checking) proof of norm being submultiplicative

Published on 24 Jan 2020 - 3:27

score 215 · Answer 12 · 2026-03-25 06:58:55

215

Views

Does $\iint_D \frac{x^2}{x^2+y^2} dx dy $ converge on $D= \left\{ (x, y) : x^2+y^2\leq ax \right\} $ ? If yes, what value does it converge to?

Published on 25 Mar 2026 - 6:58

score 129 · Answer 13 · 2020-01-24 04:10:32

129

Views

Is $G= \mathbb{Z}$ a group with binary operation defined as $a \cdot b \equiv a - b$?

Published on 24 Jan 2020 - 4:10

score 119 · Answer 14 · 2020-01-24 07:01:20

119

Views

Definition of positive in $\mathbb{Q}$ is well-defined.

Published on 24 Jan 2020 - 7:01

score 140 · Answer 15 · 2020-01-24 07:52:06

140

Views

Definition of injective maps in Category theory and the relation of this definition to our ordinary definition.

Published on 24 Jan 2020 - 7:52

List Question

Show if $G$ is a planar graph, then $G\setminus e$ is also planar

verify the dimension theorem for this function

Sturm-Liouville exercise: finding linearly independent solutions

Find the number of ways in which $12$ people can be seated at a square table for the following given data.

There are $20$ books on Algebra & Calculus in our library. Find the condition of maximum selections each of which consist of $5$ books on each topic.

Prove/Disprove $\begin{pmatrix} a & b \\ c & d \end{pmatrix}$ positive/negative definite and indefinite

Is this proof of the convergence of two improper integrals correct?

On the solvability with radicals of a 4th degree polynomial

Proving $(A \times C) \cup (B \times D) \subset (A \cup B) \times (C \cup D)$

For finite $S$, if $f:S\rightarrow S$ is surjective, then $f$ is injective.

(Help checking) proof of norm being submultiplicative

Does $\iint_D \frac{x^2}{x^2+y^2} dx dy $ converge on $D= \left\{ (x, y) : x^2+y^2\leq ax \right\} $ ? If yes, what value does it converge to?

Is $G= \mathbb{Z}$ a group with binary operation defined as $a \cdot b \equiv a - b$?

Definition of positive in $\mathbb{Q}$ is well-defined.

Definition of injective maps in Category theory and the relation of this definition to our ordinary definition.

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