Andres Caicedo

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Set theorist, combinatorialist.


360 Answers

newest activity votes
50
Find the average of $\sin^{100} (x)$ in 5 minutes?
38
In a group we have $abc=cba$. Is it abelian?
34
If $f,g$ are both analytic and $f(z) = g(z)$ for uncountably many $z$, is it true that $f = g$?
29
Why Are the Reals Uncountable?
28
Is it possible to prove a mathematical statement by proving that a proof exists?
26
function that is its own inverse
25
How can I prove that $n^7 - n$ is divisible by $42$ for any integer $n$?
23
Is this number transcendental?
23
Finding Value of the Infinite Product $\prod \Bigl(1-\frac{1}{n^{2}}\Bigr)$
22
Why is the Möbius strip not orientable?
20
If a function can only be defined implicitly does it have to be multivalued?
20
What's the theory in which incompleteness of PA is proved?
20
Proving that a series converges to an irrational number
19
bound on the cardinality of the continuum? I hope not
18
What is a point?
18
What is the difference between Gödel's Completeness and Incompleteness Theorems?
18
Why does $x$ vanish in the group $\langle x,y\mid x^3, y^3, yxyxy\rangle$?
17
If $\sum_{1}^{\infty}(a_n)^3$ diverges, does $\sum_{1}^{\infty}(a_n)$?
16
Prove that $(n-m) \mid (n^r - m^r)$
16
0.246810121416…: Is it a algebraic number?
15
Is there an algebraic homomorphism between two Banach algebras which is not continuous?
15
Intersection of Algebraic Topology/Geometry and Model Theory/Set Theory
15
The cardinality of a countable union of countable sets, without the axiom of choice
14
Is there an empty set in the complement of an empty set?
13
Does $\{\pi, \mathbb{R}\}$ exist?
13
Does a countable set generate a countable group?
13
Why hasn't GCH become a standard axiom of ZFC?
13
A Conjecture of Schinzel and Sierpinski
13
Examples of Taylor series with interesting convergence along the boundary of convergence?
13
Are the rationals minus a point homeomorphic to the rationals?
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