arXiv subjects

Chenfeng He

Publications and source records attributed to Chenfeng He.

4 recordsLinked to original sources

arXiv2025

Gross lattices of supersingular elliptic curves

Let $p$ be a prime, $E$ be a supersingular elliptic curve defined over $\bar{\mathbb{F}}_p$, and $\mathscr{O}$ be its (geometric) endomorphism ring. Earlier results of Chevyrev-Galbraith and Goren-Love have shown that the successive minima of the Gross lattice of $\mathscr{O}$ characterize the isomorphism class of $\mathscr{O}$. In this paper, we extend this work and show that the value of the third successive minimum $D_3$ of the Gross lattice gives necessary and sufficient conditions for the curve to have its $j$-invariant in the field $\mathbb{F}_p$ or in the set $\mathbb{F}_{p^2} \setminus \mathbb{F}_p$, as well as finer information about the endomorphism ring of $E$ when its $j$-invariant belongs to $\mathbb{F}_p$ and $p \equiv 3 \pmod{4}$. We end our article with an investigation of the geometry of Gross lattices of supersingular elliptic curves.

math.NT↗

arXiv2019

A new formula for $ζ(s)$

In this paper, by introducing a new operation in the vector space of analytic functions, the author presents a method for derivating the well-known formulas: $ζ(1-k)=-\frac{B_k}{k}$ and $ζ(1-n,a)=-\frac{B_n(a)}{n}$ , where $ζ$, $ζ(1-n,a)$ denote the Riemann zeta function and the Hurwitz zeta function respectively. $B_k$ is the $k$-th Bernoulli number. Also the author steps further to deduce some identities related to Bernoulli number and Bernoulli polynomial. Moreover, when combining the operation with forward difference, we can show a new formula for Riemann zeta function, i.e. \[ζ(s)=e\sum_{n=0}^{\infty}\sum_{i=0}^{n}(-1)^{n-i}\frac{1}{(n-i)!(1+i)^{s}}.\]

math.NT↗

arXiv2019

A new understanding of $ζ(k)$

In this paper, by introducing a new operation in the vector space of Laurent series, the author derived explicit series for the values of $ζ$-funtion at positive integers, where $ζ$ denotes the Riemann zeta function. The values of $ζ(k),\ k>1$ are largely connected with Bernoulli numbers and binomial numbers. The method in this paper seems new, and the resluts are about divergent series. Using Borel summation for these divergent series one can connect $ζ$ function, Bernoulli numbers, and most series representations of Riemann zeta function.

math.NT↗

arXiv2015

GMOL: An Interactive Tool for 3D Genome Structure Visualization

It has been shown that genome spatial structures largely affect both genome activity and DNA function. Knowing this, many researchers are currently attempting to accurately model genome structures. Despite these increased efforts there still exists a shortage of tools dedicated to visualizing the genome. Creating a tool that can accurately visualize the genome can aid researchers by highlighting structural relationships that may not be obvious when examining the sequence information alone. Here we present a desktop application, known as GMOL, designed to effectively visualize genome tertiary structures at multiple scales so that researchers may better analyze their genomic data. GMOL was developed based upon our multi-scale approach that allows a user to zoom in and out between six separate levels within the genome. These six scales are full genome, chromosome, loci, fiber, nucleosome, and nucleotide. In order to store the data of the different scales, a new file format, known as GSS, was created. With GMOL, a user can choose any unit at any scale and scale it up or down to visualize its structure and retrieve corresponding genome sequences from either Ensembl or a local database. Users can also interactively manipulate and measure the whole genome structure and extract static images and machine-readable data files in PDB format from the multi-scale structure. By using GMOL researchers will be able to better understand and analyze genome structure models and the impact their structural relations have on genome activity and DNA function through GMOLs unique features and functions, which includes the multi-scale method that can satisfy the users requirement to not only visualize genome tertiary structure, but also measure it.

q-bio.GN↗