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bjd2385
  • Member for 9 years, 9 months
  • Last seen more than 1 year ago
17 votes
2 answers
4k views

A general question about the Collatz Conjecture and finding that integer that doesn't work

12 votes
3 answers
3k views

A pedantic question about notation -- "such that" symbols

9 votes
2 answers
234 views

Find $\mathcal{L}\left\{\cos^3\left(t\right)\right\}$

9 votes
3 answers
305 views

Solve $\int_0^2\sqrt{x} \, d\sqrt{x}\overset{?}{=}$

8 votes
1 answer
535 views

My first partial differential equation attempt

6 votes
2 answers
1k views

Bernoulli Numbers

5 votes
6 answers
3k views

Integrate $\int\sqrt{1+9t^4}\:dt$

5 votes
1 answer
1k views

What does "$\mathbb{1}$" mean in this document?

5 votes
1 answer
2k views

Eigenvalues/vectors of the Laplace transform?

4 votes
5 answers
221 views

Closed form for $\int \left(1-x^{2/3}\right)^{3/2}\:dx$

4 votes
3 answers
2k views

Prove even integer sum using induction

4 votes
1 answer
251 views

How do they go from implicit partial differentiation in this problem to solving with a determinant?

4 votes
2 answers
136 views

How do I solve this integral $ \int_0^{\frac{\pi}{2}-}\frac{dx}{1+\tan^{\sqrt{2}}\left(x\right)} $? (looking for hints)

3 votes
5 answers
905 views

How do I make this simple proof better (and more correct?)

3 votes
2 answers
164 views

How to integrate $\int_0^1 \sqrt{-x^6+x^4-x^2+1}\:dx$

3 votes
1 answer
69 views

Prove difference of summations $=\frac{e^2}{2}$

3 votes
1 answer
107 views

A quickie about set theory notation

3 votes
2 answers
58 views

Is my deduction of $t$ being true logically correct?

3 votes
1 answer
26k views

Intersection of two parametric lines

3 votes
2 answers
49 views

Visualizing $\partial A$

3 votes
2 answers
65k views

Proving $\sum_{i=0}^n 2^i=2^{n+1}-1$ by induction. [duplicate]

3 votes
2 answers
2k views

Writing Corollaries into Proofs

3 votes
1 answer
133 views

Is $\sum_{n=1}^\infty \frac{\left(-1\right)^{n+1}\log\left(n\right)}{n}$ divergent?

3 votes
3 answers
108 views

Evaluate $\lim_{x\rightarrow\infty}\left(\Gamma\left(1/x\right)\right)^{-1}\int_{0}^{x}\frac{|\sin\left(t\right)|}{t}\:dt$

3 votes
1 answer
64 views

What's the relationship between a polynomial $P_{n}\left(x\right)$ and $P_{n}\left(\frac{d}{dx}\right)$?

3 votes
1 answer
169 views

Is there a name for the norm $||\mathbf{x}||_{W}^{2}=\mathbf{x}^{T}W^{T}W\mathbf{x}$?

3 votes
2 answers
1k views

Variation of Parameters: why do we assume the "constraint" $v'_1\left(t\right)y_1\left(t\right)+v_2'\left(t\right)y_2\left(t\right)=0$? [duplicate]

3 votes
0 answers
108 views

Change of variables in $\iiiint$ or $\idotsint$?

3 votes
0 answers
83 views

What is the "$\cdot$" in this: $\left\langle \nabla f,\:\cdot\right\rangle$

2 votes
2 answers
39 views

I need help setting up these limits of integration (triple integrals)