All Questions
Tagged with reference-request nt.number-theory
1,409 questions
8
votes
1
answer
726
views
Hecke characters and Conductors
Motivation: Let $\ell$ be an odd prime. There is a conductor-preserving correspondence between primitive Dirichlet characters of order $\ell$
and cyclic, degree $\ell$ number fields $K/\mathbb{Q}$.
...
- 998
17
votes
2
answers
2k
views
Why does Tate's conjecture imply semisimplicity of crystalline Frobenius?
I'm trying to find a reference for the following fact:
If Tate's conjecture is true for all smooth projective varieties over $\mathbb{F}_p$, then the Frobenius endomorphism on the crystalline ...
- 37k
3
votes
0
answers
198
views
On the equation $x^3+y^3+z^3-2xyz=N$
The following question was asked at MSE without any solution:
Show that the equation $x^3+y^3+z^3-2xyz=1$ have infinitely many integer solutions $(x,y,z)$.
A more general question was also ...
- 3,153
9
votes
2
answers
839
views
Reference and best bounds of $\sum_{n\leq x}\frac{\mu(n)}{n}$
Could someone please provide information about the best possible known bounds of the sum $$A(x)=\sum_{n\leq x}\frac{\mu(n)}{n}?$$ Unconditionally, $A(x)=O(e^{-c\sqrt{\log x}})$ is known to me. Does ...
- 1,692
3
votes
3
answers
315
views
Minimal expression of 0 as a sum of kth powers in a finite field
Let $l=\min\{s\in \mathbb{N}|0\in s\cdot (\mathbb{F}_{p^n}^\times)^k\}$. Is any information known about this number already as a function of $k$? Any reference would be greatly appreciated!
- 203
1
vote
0
answers
156
views
Fejer-Jackson-like inequality with divisor sum
A question was recently asked about a generalization of the Fejer-Jackson inequality $$\sum_{k=1}^n \frac{\sin kx}{k}\gt 0 \quad \forall\: n\in\mathbb{Z}^+\: \text{and}\: 0\lt x\lt\pi$$
to ...
- 105
11
votes
1
answer
1k
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Best results regarding the Lang-Trotter conjecture
Let $E$ be an elliptic curve over $\mathbb Q$, which does not have complex multiplication over the algebraic closure of $\mathbb Q$. For $x>0$, let $P(x)$ be the number of primes $p < x$ such ...
- 26k
5
votes
1
answer
703
views
How to construct an abelian variety with CM by a given CM field?
Let $F$ be a totally real number field, and let $K$ be a quadratic extension of $F$ which cannot be embedded into $\mathbb{R}$.
Then $K$ is a so called CM field.
For instance, take $F = \mathbb{Q}(\...
- 11.3k
1
vote
1
answer
258
views
Is it proved that for every integer $p>0$ there exists an integer $k>0$ such that every integer $n>0$ can be expressed as $j_1^p+\dots+j_k^p$?
It has been shown, by elementary methods, that every positive integer can be expressed as the sum of $4$ squares. This type of result has been proven for many different powers $p$, for example, when $...
- 1,247
2
votes
1
answer
241
views
2-parts of class numbers of binary quadratic forms for non-fundamental discriminants
I need a formula for the 2-adic valuation of the number of proper equivalence classes of primitive positive definite binary quadratic forms of discriminant $-D$, call it $h_0(-D)$. I'm sure the answer ...
- 189
8
votes
1
answer
2k
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Prof. Murty's B. Sc. Thesis
Can any of you guys help me to find out if there is a retrodigitized copy of M. Ram Murty's 1976 thesis available on the online database of Carleton University Library?
I really hope this question is ...
- 8,842
8
votes
3
answers
882
views
Reference request for $(1,2^n-1,2^n)$ example related to abc-conjecture
The $abc$-conjecture states that if $a,b,c$ are positive, relatively prime integers satisfying $a+b=c$, then the product of the primes dividing $abc$ (the radical of $abc$) is $\gg_\varepsilon c^{1-\...
- 12.8k
9
votes
1
answer
942
views
Residue class sufficiency sets for the Collatz conjecture
I have recently managed to show a sequence of sufficiency sets for the Collatz conjecture whose natural density approaches 0 (the set theoretic limit approaches the set $\{1\}$). It is an extension of ...
- 2,275
2
votes
1
answer
212
views
When will the value of automorphic function $f(x)$ satisify an algebraic equation?
When will the value of automorphic function $f(x)$ satisfy an algebraic equation? Or what is the value of $x$ such that the value of automorphic function $f(x)$ is algebraic?
If the question is too ...
- 3,104
7
votes
2
answers
1k
views
When is a sequence the sum of two Beatty sequences?
In other words, given a sequence $(s_n)$, how can we tell if there exist irrationals $u>1$ and $v>1$ such that
$$s_n = \lfloor un\rfloor + \lfloor vn\rfloor$$
for every positive integer $n$?
...
- 3,443
3
votes
0
answers
97
views
$L$-functions for quadratic orders and Siegel's solution of the class number problem
Let $K$ be an imaginary quadratic field and $D_K$ its discriminant. Further let $\mathcal O$ be an order in $K$ with conductor $f$ and
$$L(\chi,s)=\sum_{\mathfrak a}\chi(\mathfrak a)N(\mathfrak a)^{-...
- 2,375
3
votes
0
answers
254
views
Looking for Coleman's paper "The Gross-Koblitz formula"
I am looking for a copy of the following paper by Robert Coleman:
The Gross-Koblitz formula.
Galois representations and arithmetic algebraic geometry
(Kyoto, 1985/Tokyo, 1986), 21–52,
Adv. Stud. ...
- 3,107
5
votes
2
answers
342
views
Minimum length of a convex lattice polygon containing k lattice points?
Let $f(k)$ denote the minimum length of a convex lattice polygon containing exactly $k$ lattice points (including lattice points on the boundary).
It is not too hard to show that $k = \frac{1}{4\pi} ...
- 191
3
votes
6
answers
2k
views
Teach a course in 1 month
I need to teach an intro course on number theory in 1 month. I was just notified. Since I have never studied it, what are good books to learn it quickly?
7
votes
2
answers
570
views
For an approach to the Hadamard-matrix-problem: is there a proof, that the iterative plane-wise orthogonal rotations (Quartimax/Varimax) converge to global maximum?
I've asked this question at stat-exchange and at the "Semnet"-mailing list of professionals in statistics. The reference to some articles in Psychometrica (for instance ten Berge 1995, Jennrich 2001) ...
- 5,342
13
votes
2
answers
644
views
Reference for a conjecture on the first primes congruent to 1 modulo other primes
Given a prime $p$, define $f(p)$ to be the smallest prime congruent to $1$ modulo $p$. For example, $f(7)=29$. It has been conjectured that $f(p)<p^2$ always: by Schinzel in his "Hypothesis H" ...
- 12.8k
4
votes
1
answer
383
views
A "nice" trigonometric polynomial approximation of a characteristic function
Let $\delta > 0$ be small and $\chi_{[-\delta, \delta]}(t)$ be a characteristic function on the interval $[-\delta, \delta]$. I am interested in a trigonometric polynomial $S$ such that
$$
\chi_{[-\...
- 3,625
0
votes
0
answers
257
views
Hercules and the Hydra with time constraints
The game of Hercules vs. the Hydra can be put in terms of a single number in hereditarily-factorized form. For example, if the Hydra is $2^{19^3} \cdot 5^{11^7}$, Hercules must choose between two ...
- 2,302
1
vote
1
answer
241
views
Is it possible to approximate irrational by fractions with denominator and numerator odd? [closed]
Suppose $\alpha$ is a positive irrational, and $\epsilon$ is an arbitrary positive real, are there $m,n$(non-negative integers) such that $$|\alpha-(2m+1)/(2n+1)|<\epsilon/(2n+1)?$$
If they exist, ...
- 201
1
vote
0
answers
57
views
On divisibility conditions implying local coprimality conditions
This question is inspired by Bernardo Recaman's question Strings of consecutive integers divisible by 1, 2, 3, ..., N on intervals of $n$ integers being divisible by the integers $1$ through $n$. The ...
- 13k
13
votes
3
answers
2k
views
Which curves have infinitely many rational points
Question: Assuming finiteness of the Tate-Shafarevich group, is there an algorithm to determine whether a curve $C$ defined over a number field $K$ has infinitely many $K$-rational points?
I believe ...
- 5,363
6
votes
1
answer
144
views
Proportion of pairs of integer polynomials with a bounded value of the resultant
Let $f(x), g(x) \in \mathbb Z[x]$ be polynomials of positive degrees $r$ and $s$ respectively, and let $\operatorname{Res}(f,g)$ denote their resultant. Further, let $H(f)$ denote the naive height of ...
- 1,625
3
votes
1
answer
224
views
PNT analog for primes inside a structured set
Let $\Bbb T$ be the set of all square free integers with ordering derived from $\Bbb N$. Essentially $PNT$ says if you pick $\log N$ integers less than $N$ you can expect one of them to be prime.
...
- 13.9k
1
vote
3
answers
286
views
Reference book for primality testing [closed]
im searching for good reference to understand the primality testing idea
especially the Elliptic curves and primality for stirling numbers first and second ones , so can any one suggest to me good ...
- 199
2
votes
2
answers
393
views
Playing leapfrog with primes
In connection with how primes jump (How do these primes jump?),
I consider the following game.
Let $R$ be a finite set of positive integers. For this question, I content myself with $R$ being the $k$ ...
- 13k
0
votes
0
answers
142
views
Mobius function on values of an irreducible quadratic polynomial
Are there infinitely many integers $n$ for which $n^2 + 1$ is square-free, and has an even number of (necessarily distinct) prime factors ?
- 11.3k
21
votes
1
answer
771
views
Covering a set with geometric progressions
Consider the set $S_n=\{1,2,\cdots ,n\}$. What is the minimum number of distinct geometric progressions that cover $S_n$? Let us call this number $a_n$. I was wondering about this number after doing a ...
- 1,090
3
votes
0
answers
154
views
Is there a name for sequences of integers reduced to their lowest prime divisors?
When trying to obtain the value of Jacobsthal's function for some $n$; to find the largest sequence of consecutive numbers that are all coprime to $n$, one approach (and the only direct approach that ...
- 161
1
vote
1
answer
130
views
distance-set along the orbit of $e^{2\pi i\theta}$
Let $z=e^{2\pi i\theta}$ for a fixed real number $\theta$. It's known that if $\theta\not\in\mathbb{Q}$ (is irrational) then the set $S(\theta)=\{z^n: n\in\mathbb{N}\}$ is dense on the unit circle $\...
- 43.2k
4
votes
2
answers
450
views
Is there a version of Serre's modularity conjecture for projective representations?
Serre's modularity conjecture asserts that a continuous odd irreducible representation $$\overline{\rho} : G_\mathbb{Q} \rightarrow \mathrm{GL}_2(\mathbb{F}_q)$$ must be modular, in the sense that ...
- 3,142
2
votes
1
answer
450
views
Is there a "small $\omega$" number theorem?
In my studies of how primes jump (search this forum for a link), a question has been raised which may have been studied. Can anyone jump-start my literature search with references regarding the ...
- 13k
8
votes
1
answer
431
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Reference request: seminar report of Serre from late 60s on possibility of Galois representations attached to modular forms?
See here for a comment of Matt Emerton.
There are also various seminar reports of Serre, e.g. his report on mod p modular forms, but also his report from the late 60s on the possibility of Galois ...
- 83
0
votes
1
answer
210
views
Are there Vaughn's identity type decompositions for other arithmetic functions?
Vaughn's identity is a useful way to decompose the von Mangoldt function $\Lambda(n)$ into Type I and Type II components, and this is used in many problems involving prime numbers. I was wondering if ...
- 3,625
3
votes
0
answers
408
views
The second conjecture about the degrees of special polynomials
Define the congruence "modulo m" on exponential Taylor series following the previous post (A conjecture about the degrees of special polynomials)
It has been conjectured, that if we define the ...
- 237
5
votes
1
answer
232
views
Improvement of a bound on divisor distributions from "Divisors" (Hall and Tenenbaum)?
In the classic text referred to in the title of this question, the bound
$$
H(x,y,2y) \ll \frac{x}{(\log y)^{\delta}\sqrt{\log \log y}},\quad (3\leq y\leq \sqrt{x})
$$
is given, where $\delta=1-\frac{...
- 10.4k
7
votes
0
answers
572
views
Dieudonne modules vs Dieudonne crystals reference/clarification
I've read a bit about Dieudonné modules, mainly from Fontaine's "Groupes p-divisibles sur les corps locaux" and Demazure's "Lectures on $p$-divisible groups". I am familiar with the main ...
- 371
7
votes
1
answer
488
views
Ref. request: Additive probability measure on $\mathcal P({\bf N})$ supplies subset of $\mathbf R$ without Baire property
ZFC proves, among the other things, the existence of a (finitely) additive probability measure $\theta: \mathcal P(\mathbf N) \to \mathbf R$ on the power set of $\mathbf N$ such that $\theta(X) = 0$ ...
- 10.5k
3
votes
0
answers
140
views
L-functions for the Weil group over short exact sequences
Let $(\rho,V)$ be a continuous finite dimensional representation of the Weil group $W_F$ over a local field $F$. If $V$ decomposes as a direct sum $V_1 \oplus V_2$ of representations, then
$$L(s,\...
- 6,180
5
votes
0
answers
327
views
Is there a concrete way to show the existence of canonical model for non-modular Shimura curves?
I am trying to read Carayol's article on the construction of Galois representations associated to Hilbert modular forms (http://archive.numdam.org/article/CM_1986__59_2_151_0.pdf). The main geometric ...
- 2,842
5
votes
1
answer
792
views
$K_0$ of integral group ring of cyclic group $\mathbb{Z}/p\mathbb{Z}$
Is there a table for the computation of $K_0(\mathbb{Z}[\mathbb{Z}/p\mathbb{Z}])$?
These groups are also known as ideal class group in number theory.In topology,they are the home of some important ...
- 593
11
votes
4
answers
526
views
Growth of smallest closed geodesic in congruence subgroups?
Let $\Gamma$ be one of the classical congruence subgroups $\Gamma_0(N)$, $\Gamma_1(N)$ and $\Gamma(N)$ of $SL(2, \mathbb{Z})$.
How does the lower bound for the length of primitive geodesics on $\...
- 11.2k
4
votes
2
answers
546
views
A galois group is topologically finitely generated or finitely generated as a $\mathbb{Z}_p$-module
The basic set up is the following:
Let $K$ be a number field. let $p$ be an odd prime. Let $\Sigma_p$ be the set of primes of $K$ lying above $p$. Let $M$ be the composite of all finite $p$-extensions ...
- 313
4
votes
0
answers
409
views
An unpublished note by Spencer Bloch and Kazuya Kato
I am looking for an unpublished note by Spencer Bloch and Kazuya Kato, p-divisible groups and Dieudonné crystals. This note is always cited as
Spencer Bloch and Kazuya Kato, p-divisible groups and ...
- 193
9
votes
1
answer
313
views
The scope of correspondence principle in quantum chaos
My understanding of the so-called correspondence principle in quantum chaos, is that it is a connection between the behaviour of a classical Hamiltonian system (chaotic/completely integrable) and the ...
- 809
7
votes
1
answer
249
views
When is $\vartheta(x)>x$? [Skewes number analog]
Let $\vartheta(x)=\sum_{p\le x}\log p$. What is known about the first time $\vartheta(x)>x?$
Bays & Hudson give good upper bounds (slightly improved by Chao & Plymen) on the first crossing ...
- 9,114