Cameron Buie

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1,084 Answers

newest activity votes
32
Is the set of all valid C++ programs countably infinite?
31
Why is $\sqrt{8}/2$ equal to $\sqrt{2}$?
26
Solve $\cos^2x-\sin^2x= 1$
18
Is there a bijective map from $(0,1)$ to $\mathbb{R}$?
16
Is every open subset of $ \mathbb{R} $ uncountable?
16
Deducing “Some are ” from “All are”?
16
Crazy induction
13
There are no bearded men in the world - What goes wrong in this proof?
13
How to prove that $A_5$ has no subgroup of order 30?
12
Contradiction! Any Symbol for?
12
Proof : cannot draw this figure without lifting the pen
11
What is the correct definition of the absolute value of $x$, $|x|$?
11
The measure of $([0,1]\cap \mathbb{Q})×([0,1]\cap\mathbb{Q})$
10
Proof $(A-\{a\}) \sim (B - \{b\}) $
10
How do you find the limit of $\lim_{x \to 0} \frac{1-e^{6x}}{1-e^{3x}}$
10
Name that theorem: $G/\ker(\phi) \cong \bar{G}$ for epimorphism $\phi : G \to \bar{G}$
10
Your favourite application of the Baire category theorem
9
Finding the value of $b$ so $\int_1^b (x-2)^3 dx =0$
9
Does there exist a continuous bijective function $ \displaystyle f : \Bbb R \rightarrow \Bbb R − \{1\}$?
9
Prove that if $i$ and $j$ are integers, the $\langle a^i \rangle = \langle a^j \rangle$ iff $i=\pm j$
9
Show that the set of all finite subsets of $\mathbb{N}$ is countable.
9
Calculating the minimum of $\cos x \sin y$
9
$f$ strictly increasing does not imply $f'>0$
9
How to evaluate $\int\limits^1_0 \sqrt{1+\frac{1}{x}}\, \text{d}x$
8
Definition of Simple Group
8
Equation $(8\cos^3x+1)^3=162\cos x-27$
8
How to find the roots of $f(x)=x^{2}+2x+2$ in $\mathbb{Z}_{3}$ ? in $\mathbb{Z}_{5}$ ? in $\mathbb{R}$?
8
$\forall m \exists n$, $mn = n$ True or False
8
Prove that if for every $x \in \mathbb{R}^N$ $Ax=Bx$ then $A=B$
8
physics- the velocity is zero but the speed is a non zero quantity. Which statement can you make about this motion?
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