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Benjamin Krakoff

Publications and source records attributed to Benjamin Krakoff.

4 recordsLinked to original sources
arXiv2022

Projectively Invariant Hardy Spaces on Domains with Corners

For smoothly bounded, strongly $\mathbb{C}$-convex domains, one can use the Fefferman form or its variants to define projectively invariant norms on sections of holomorphic line bundles, producing a Hardy space. In two variables, we construct a projectively invariant measure on the singular part of a piece-wise smooth domain, and show that positivity of this invariant coincides with a notion of strong $\mathbb{C}$-convexity that is compatible with Cauchy-Fantappi\'e-Leray kernels, and thus define projectively invariant Hardy spaces as in the smooth case.

math.CV↗
arXiv2021

A QUBO Algorithm to Compute Eigenvectors of Symmetric Matrices

We describe an algorithm to compute the extremal eigenvalues and corresponding eigenvectors of a symmetric matrix by solving a sequence of Quadratic Binary Optimization problems. This algorithm is robust across many different classes of symmetric matrices, can compute the eigenvector/eigenvalue pair to essentially arbitrary precision, and with minor modifications can also solve the generalized eigenvalue problem. Performance is analyzed on small random matrices and selected larger matrices from practical applications.

cs.ET↗
arXiv2020

Counting Finite Index Subrings of $\mathbb{Z}^n$

We count subrings of small index of $\mathbb{Z}^n$, where the addition and multiplication are defined componentwise. Let $f_n(k)$ denote the number of subrings of index $k$. For any $n$, we give a formula for this quantity for all integers $k$ that are not divisible by a 9th power of a prime, extending a result of Liu.

math.CO↗