Chris Eagle

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364 Answers

newest activity votes
34
How to prove that the number 1!+2!+3!+…+n! is never square?
31
Proof that a natural number multiplied by some integer results in a number with only one and zero as digits
29
Getting the sequence $1, 0, -1, 0, 1, 0, -1, 0, \ldots$ without trig?
26
How do I prove that $\cos{\frac{2\pi}{7}}\notin\mathbb{Q}$?
22
Are the functions $\sin^n(x)$ linearly independent?
20
Why is $\mathbb{Z}[\sqrt{-n}]$ not a UFD?
20
Is it true that a space-filling curve cannot be injective everywhere?
20
entire bijection of $\mathbb{C}$ with 2 fixed points
16
does the uniform continuity of $f$ implies uniform continuity of $f^2$ on $\mathbb{R}$?
14
$\forall m \exists n$, $mn = n$ True or False
14
Is this a property of an integral domain that is not a field?
14
Simple example of a continuous onto function mapping $[0,1]$ to $\mathbb R$
14
Does the functional equation $f(1/r) = rf(r)$ have any nontrivial solutions besides $f(r) = 1/\sqrt{r}$?
13
Why can't we just say 1 instead of “unity”?
13
A subgroup such that every left coset is contained in a right coset.
13
Is there an easy example of a vector space which can not be endowed with the structure of a Banach space
13
Collection of continuous functions determines the topology
13
Proving the non-existence of a limit
13
Why is the ratio test for L=1 inconclusive?
13
Minimal non-cyclic groups other than the Klein four groups
12
How many paths exist between two points in the plane?
12
Prove that this is a group
11
Compactness in $\mathbb{Q}$
11
Transcendentality of the $\log$ of the golden mean
11
Fundamental group of $S^2$ with north and south pole identified
10
What is the value of $\aleph_1^{\aleph_0}$?
10
Why do some people use $+\infty$ instead of $\infty$?
10
Finding all groups with $\text{Aut}(G)=\{1\}$
10
In a monoid, does $x \cdot y=e$ imply $y \cdot x=e$?
10
Can the real field be made a vector space over the complex field?
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