What is Expositio?
A public repository for expository academic papers, with an integrated scholarly record.
Expositio is a place to read and cite expository work. Papers are published as stable,
citable records, while remaining connected to later versions, editorial decisions,
and related context.
Some papers are early drafts; others have been peer reviewed or formally published.
Each paper remains readable on its own, while preserving the history behind it.
The result is both a reading room and a record: a place to browse by field, read
papers in stable form, and follow their development over time.
v1
The symmetric groups are fundamental objects in abstract algebra, and for
nearly every value of n, their automorphism groups are completely inner. The unique
exception is the symmetric group S_6, which possesses a nontrivial outer automorphism. This
paper develops the theory…
Mathematics / Group theory and generalizations
v1
This paper gives an expository introduction to arithmetic progressions in Ramsey theory and additive combinatorics. We begin with the language of colorings, using small examples to illustrate how simple coloring rules can force surprisingly rigid structure. The main result discu…
Mathematics / Combinatorics
v1
In this paper, we will introduce Fourier Series through the Orthogonality Relations from which we consider Parseval's Theorem. Then, we wish to extend the concept of Fourier Series of aperiodic functions, specifically showing the Fourier Transform. The usage of the Fourier Trans…
Mathematics / Abstract harmonic analysis
v1
Firstly, we will introduce some preliminary theory about Newton Polygons while presenting some comments for their uses. Our main focus is analyzing the Newton Polgons of general functions, specifically power series, of which a few important lemmas are shown. Finally, we collate …
Mathematics / Number theory
v1
This paper introduces Minimal Surfaces through the Weingarten Map and the 1st and 2nd Fundamental forms. Then, we consider two examples of a minimal surface, the catenoid and helicoid, verifying that both are indeed minimal surfaces through calculation. Finally, we end with two …
Mathematics / Differential geometry
v1
We investigate the geometric and combinatorial properties of polytope
triangulations, focusing on their connections to Ehrhart positivity.
The Ehrhart polynomial L(P,t) encodes the number of integer points in dilated
copies of a polytope, and establishing the positivity of …
Mathematics / Convex and discrete geometry
