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11

30

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2

answers

6k

views

Strategies and Tips: What to do when stuck on math?

soft-question advice

Sep 4 '17 at 21:09 TheMathochist 81

24

23

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3

answers

2k

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Aug 16 '13 at 11:39 Community♦ 1

7

17

votes

4

answers

2k

views

How can I correct my wrong Intuition that $\forall \, x \, \in \,\emptyset : P(x) \quad $ is false?

logic

Nov 18 '18 at 20:25 Charlie Parker 6,902

10

13

votes

3

answers

18k

views

If every convergent subsequence converges to $a$, then so does the original bounded sequence (Abbott p 58 q2.5.4 and q2.5.3b)

real-analysis proof-verification

Nov 10 '19 at 11:56 Kartik 1

5

13

votes

4

answers

25k

views

Intuition for cross product of vector with itself and vector with zero vector

linear-algebra

Mar 15 '17 at 16:49 nbro 5,547

4

12

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3

answers

2k

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How can I prove $\nabla \cdot \color{green}{(\mathbf{F} {\times} \mathbf{G})} $ with Einstein Summation Notation?

multivariable-calculus derivatives

May 19 '18 at 5:29 Community♦ 1

8

12

votes

1

answer

556

views

Journals or Magazines on Study Skills or How to Study Math

reference-request soft-question education self-learning

Jul 18 '13 at 7:41 Willie Wong 66.1k

6

11

votes

2

answers

11k

views

Find all proper nontrivial subgroups of $\mathbb Z_2 \times \mathbb Z_2 \times \mathbb Z_2$ - Fraleigh p. 110 Exercise 11.10

group-theory proof-verification cyclic-groups

Feb 23 '20 at 2:09 user46372819 10.3k

11

votes

4

answers

8k

views

Equation of Cone vs Elliptic Paraboloid

geometry multivariable-calculus

Sep 27 '18 at 13:31 Community♦ 1

2

11

votes

4

answers

1k

views

Scratch work for delta-epsilon proof for $\lim_{x \to 13} \sqrt{x-4} = 3$

real-analysis proof-verification

Mar 14 '14 at 22:21 Community♦ 1

5

10

votes

8

answers

9k

views

Quotient Group G/G = {identity}?

group-theory

Apr 26 '20 at 17:11 Ari Royce 578

3

10

votes

1

answer

1k

views

How often should math students take day breaks and longer breaks or vacations? Any research?

soft-question education advice

May 11 '14 at 13:20 NNOX Apps 1

5

10

votes

3

answers

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Strong Induction Proof: Fibonacci number even if and only if 3 divides index

elementary-number-theory induction fibonacci-numbers proof-verification

Dec 8 '13 at 5:49 Community♦ 1

2

9

votes

3

answers

10k

views

Tricks - Prove Homomorphism Maps Identity to Identity - Fraleigh p. 128 Theorem 13.12(1.)

group-theory intuition

Apr 27 '14 at 16:57 NNOX Apps 1

7

9

votes

1

answer

9k

views

Jacobian or No Jacobian - Surface Integrals

multivariable-calculus

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1

8

votes

6

answers

2k

views

How can I deduce a lower hemisphere's boundary's orientation?

multivariable-calculus

May 19 '18 at 5:43 Community♦ 1

2

8

votes

5

answers

7k

views

Expression of an Integer as a Power of 2 and an Odd Number (Chartrand Ex 5.4.2[a])

elementary-number-theory

Apr 10 '18 at 3:50 Missyinvisible 143

6

8

votes

2

answers

14k

views

Which are the Bound and Free Variables in these expressions?

logic

Jan 2 '16 at 3:33 Community♦ 1

2

8

votes

4

answers

1k

views

Group Action - Permutation on the Polynomial

group-theory permutations symmetric-groups group-actions

Feb 24 '14 at 16:13 NNOX Apps 1

1

7

votes

2

answers

1k

views

Find all subgroups of $\mathbb{Z_2} \times \mathbb{Z_2} \times \mathbb{Z_4}$ isomorphic to the Klein $4$-group.

group-theory solution-verification cyclic-groups

Jul 9 '20 at 7:01 Community♦ 1

4

7

votes

3

answers

9k

views

A subsequence of a convergent sequence converges to the same limit. Questions on proof. (Abbott p 57 2.5.1)

real-analysis proof-verification

Jan 24 '15 at 17:54 Community♦ 1

3

7

votes

6

answers

2k

views

$ \{x : P(x)\} $ vs. $ \{P(x) : x\} $ -— When are these set-builder notations the same and different?

elementary-set-theory intuition

Mar 4 '14 at 16:28 Community♦ 1

4

7

votes

3

answers

9k

views

Combinatorial Proof of Multinomial Theorem - Without Induction or Binomial Theorem

combinatorics alternative-proof combinatorial-proofs

Nov 25 '13 at 8:52 NNOX Apps 1

3

6

votes

1

answer

2k

views

De-mystifying tricks in proof – If $\{x_n\}$ converges, then Cesaro Mean converges.

real-analysis sequences-and-series solution-verification

Apr 22 '20 at 4:38 NNOX Apps 1

5

6

votes

4

answers

3k

views

Any set with Associativity, Left Identity, Left Inverse, is a Group. - Fraleigh p.49 4.38

abstract-algebra group-theory intuition

Jun 6 '19 at 6:05 Hagen von Eitzen 347k

1

6

votes

3

answers

3k

views

Intuition/Real-life Examples: Pairwise Independence vs (Mutual) Independence

probability intuition

Mar 26 '19 at 3:18 Lerner Zhang 527

2

6

votes

1

answer

19k

views

What's the proof stategy for: Hermitian matrix has orthogonal eigenvectors for distinct eigenvalues?

linear-algebra matrices

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3

6

votes

3

answers

638

views

How can a Fields Medallist be 'not very good at logic'? [closed]

logic education

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2

6

votes

1

answer

1k

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Derivation or Intuition of Formula for Levi-Civita Symbol

multivariable-calculus tensors

May 12 '15 at 5:36 user26872 17.5k

3

6

votes

1

answer

11k

views

Determinant with Levi-Civita Symbol?

determinant

May 7 '15 at 5:16 Community♦ 1

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416 Questions

Strategies and Tips: What to do when stuck on math?

How to Garner Mathematical Intuition

How can I correct my wrong Intuition that $\forall \, x \, \in \,\emptyset : P(x) \quad $ is false?

If every convergent subsequence converges to $a$, then so does the original bounded sequence (Abbott p 58 q2.5.4 and q2.5.3b)

Intuition for cross product of vector with itself and vector with zero vector

How can I prove $\nabla \cdot \color{green}{(\mathbf{F} {\times} \mathbf{G})} $ with Einstein Summation Notation?

Journals or Magazines on Study Skills or How to Study Math

Find all proper nontrivial subgroups of $\mathbb Z_2 \times \mathbb Z_2 \times \mathbb Z_2$ - Fraleigh p. 110 Exercise 11.10

Equation of Cone vs Elliptic Paraboloid

Scratch work for delta-epsilon proof for $\lim_{x \to 13} \sqrt{x-4} = 3$

Quotient Group G/G = {identity}?

How often should math students take day breaks and longer breaks or vacations? Any research?

Strong Induction Proof: Fibonacci number even if and only if 3 divides index

Tricks - Prove Homomorphism Maps Identity to Identity - Fraleigh p. 128 Theorem 13.12(1.)

Jacobian or No Jacobian - Surface Integrals

How can I deduce a lower hemisphere's boundary's orientation?

Expression of an Integer as a Power of 2 and an Odd Number (Chartrand Ex 5.4.2[a])

Which are the Bound and Free Variables in these expressions?

Group Action - Permutation on the Polynomial

Find all subgroups of $\mathbb{Z_2} \times \mathbb{Z_2} \times \mathbb{Z_4}$ isomorphic to the Klein $4$-group.

A subsequence of a convergent sequence converges to the same limit. Questions on proof. (Abbott p 57 2.5.1)

$ \{x : P(x)\} $ vs. $ \{P(x) : x\} $ -— When are these set-builder notations the same and different?

Combinatorial Proof of Multinomial Theorem - Without Induction or Binomial Theorem

De-mystifying tricks in proof – If $\{x_n\}$ converges, then Cesaro Mean converges.

Any set with Associativity, Left Identity, Left Inverse, is a Group. - Fraleigh p.49 4.38

Intuition/Real-life Examples: Pairwise Independence vs (Mutual) Independence

What's the proof stategy for: Hermitian matrix has orthogonal eigenvectors for distinct eigenvalues?

How can a Fields Medallist be 'not very good at logic'? [closed]

Derivation or Intuition of Formula for Levi-Civita Symbol

Determinant with Levi-Civita Symbol?