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White noise vs. black noise

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Martin Hairer

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Question concerning the coefficients of block idempotents

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Geoff Robinson

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Why do Physicists need unitary representation of Kac-Moody algebra?

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José Figueroa-O'Farrill

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Are algebraic groups over algebraically closed fields Cohen–Macaulay?

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Matthieu Romagny

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Object of proven finiteness, yet with no algorithm discovered?

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Woett

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Pasch axiom and Pythagorean field condition?

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Object of proven finiteness, yet with no algorithm discovered?

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Object of proven finiteness, yet with no algorithm discovered?

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"Softness" vs "rigidity" in Geometry

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Anton Petrunin

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Lower bounds on (truncated) Fourier transform of functions of constant modulus and bounded derivative

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Why are smooth irreducible representations of the Weil group finite dimensional?

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Will Sawin

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Converses to Cartan's Theorem B

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David E Speyer

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Object of proven finiteness, yet with no algorithm discovered?

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Timothy Chow

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Object of proven finiteness, yet with no algorithm discovered?

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Joe Silverman

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Example of a good Zero Knowledge Proof

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CCat

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Closed form for $\sum_{n=0}^\infty \frac1{2^{2^n}}$?

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Carlo Beenakker

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A manifold whose tangent space is a sum of line bundles and higher rank vector bundles

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Robert Bryant

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Reference request: Software for producing sounds of drums of specified shapes

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Carlo Beenakker

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Could efficient solutions of $x^2+n y^2=A$ be related to integer factorization?

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Aurel

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Is there a known elliptic curve, $E/\Bbb{Q}$, such that the rank of $E_D/\Bbb{Q}$ is bounded by some constant $M$, for all integers $D \in \Bbb{Z}$?

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Stanley Yao Xiao

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Defining Equations of a Flag Variety

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Allen Knutson

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Finite verification for theorems due to Busy Beaver numbers

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Can an integral equation always be rewritten as a differential equation?

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mathphysicist

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Hilbert's approach to Riemann hypothesis using Fredholm's work

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paul garrett

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What do models where the CH is false look like?

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Teaching undergraduate students to write proofs

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Bob Pego

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Are any embeddings $[0,1]\to\mathbb{R}^3$ topologically equivalent?

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Shijie Gu

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Solve $\binom{n}{k}=m$ for $(n,k)$

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Daniel Weber

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Product structure in Milnor exact sequence

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Finite verification for theorems due to Busy Beaver numbers

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Finite verification for theorems due to Busy Beaver numbers

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Lattices on classical combinatorial families

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Complexity of coherence diagrams in an $n$-category

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Saal Hardali

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abelian categories vs. additive categories

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Martin Brandenburg

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Is there any formal foundation to ultrafinitism?

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A Model Category of Segal Spaces?

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Charles Rezk

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Is there a minimal (least?) countably saturated real-closed field?

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Why this genus one curve over $\mathbb{F}_5$ appear to violate Hasse-Weil bound?

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Can we approximate any open set by sub-domains with smooth boundary?

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Mohammad Ghomi

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Is there a theorem which provides conditions under which a power series satisfies the reciprocal root sum law?

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Is there a prime number $p$ such that $p$ divides the class number of $\mathbb{Q}(\sqrt{-p})$?

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GH from MO

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Can local $0^\#$ exists in L?

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Asaf Karagila♦

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Can local $0^\#$ exists in L?

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Farmer S

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Simple motivation to study arithmetic geometry

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KConrad

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Exponential map

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Schreier-Sims algorithm for solving Rubik's cube

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Extremely messy proofs

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Representablity of Cohomology Ring

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Computing the Galois group of a polynomial

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Irreducible representation of the product of two groups and tensor product

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Venkataramana

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Laplace transform and fractional moments

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Determinant of a certain Toeplitz matrix

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Citation hunting: Floer on spectral sequences

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A recurrence satisfied by a function asymptotic to $n^n$

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Fedor Petrov

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Does GCH for alephs imply the axiom of choice?

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Asaf Karagila♦

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Low dimensional homotopy groups of $\operatorname{Top}(4)$

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skupers

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What is the formula for $\mathcal P_{n}^{k} (a_{1}, a_{2}, ...)$, defined by Peter Luschny?

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Peter Taylor

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Approximation property counterexamples? (Also: relation to tensor products)

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Yemon Choi

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Does closedness of the image of unit sphere imply the closed range of the operator

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Jochen Glueck

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Books in advanced differential topology

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The Mathemagician

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