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31 votes
2 answers
6k views

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

24 votes
3 answers
2k views

How to Garner Mathematical Intuition

17 votes
4 answers
2k views

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

17 votes
3 answers
21k 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)

15 votes
4 answers
31k views

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

13 votes
2 answers
14k views

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

12 votes
3 answers
3k views

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

12 votes
1 answer
583 views

Journals or Magazines on Study Skills or How to Study Math

11 votes
4 answers
9k views

Equation of Cone vs Elliptic Paraboloid

11 votes
8 answers
10k views

Quotient Group G/G = {identity}?

11 votes
4 answers
1k views

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

10 votes
1 answer
1k views

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

10 votes
3 answers
11k views

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

10 votes
4 answers
1k views

Group Action - Permutation on the Polynomial

10 votes
1 answer
10k views

Jacobian or No Jacobian - Surface Integrals

9 votes
3 answers
10k views

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

8 votes
5 answers
8k views

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

8 votes
2 answers
15k views

Which are the Bound and Free Variables in these expressions?

8 votes
6 answers
2k views

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

8 votes
3 answers
10k views

Combinatorial Proof of Multinomial Theorem - Without Induction or Binomial Theorem

7 votes
6 answers
2k views

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

7 votes
2 answers
2k views

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

7 votes
3 answers
10k views

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

7 votes
1 answer
14k views

Determinant with Levi-Civita Symbol?

7 votes
1 answer
203 views

Explain to a 15 y.o. Byron Schmuland's answer that uses Summation and Product notations to solve the Crazy Lady Airplane Seat probability problem?

6 votes
3 answers
703 views

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

6 votes
1 answer
22k views

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

6 votes
2 answers
264 views

Prove $ \int_{C}fdr=\int_{S}dS\times\nabla f$

6 votes
2 answers
6k views

Intuition - If $Ax = b$ has infinitely many solutions, why can't $Ax = c$ have only one solution? [Strang P165 3.4. 22]

6 votes
1 answer
3k views

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

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