Andrés R. Vindas Meléndez

Yay! Congratulations! When you know where you’re officially heading, I’m curious to hear!

From Feb. 27–28, the #InnovationAcceleratorLab for Data Science and Social Impact will be hosting the Driving the Impact of Data Science (DIoDS) conference at #HMC. The #DIoDS conference will explore how #DataScience can be leveraged responsibly to serve society. More info at uqr.to/2627h.

Pretty much the same! 😂😭

I got my first “I f@#*ing hate math” of the year from someone who asked what I do for a living 🙃

Happy new year!

#mathsky

Join us Feb 27-28, 2026 at Harvey Mudd College (@hmc.edu) for the Driving the Impact of Data Science (DIoDS) Conference!

We have a wonderful lineup of speakers!

There are different ways to contribute!

Registration & information in the link below.

#mathsky

www.hmc.edu/dssi/diods-c...

The Mathematical Connections Seminar is something I have started and organized since coming to Harvey Mudd. If you’re ever in the area and would love to speak at the MCS, please reach out!

Combinatorics friends and math friends in/near Pittsburgh, I invite you to attend "Combinatorics at the Confluence" July 2026! #MathSky

Jul 20-22, Carnegie Mellon University, Pittsburgh, PA, Combinatorics at the Confluence

combcon.github.io

HMC mathematics professor @arvm.bsky.social has received an NSF grant that will fund geometric combinatorics research. Vindas Meléndez & his students will collaborate on original problems, many drawn from Ehrhart theory, which studies the properties of polytopes. uqr.to/nsf-gcr.

Thank you! :)

Hey, it's me :)

NSF Grant Funds Geometric Combinatorics Research at @hmc.edu ! #MathSky

www.hmc.edu/about/2025/0...

Group of mathematicians and friends taking selfie.

Mathematicians chatting around table.

Happy to have had friends and colleagues from Harvey Mudd, Pomona College, and Cal Poly Pomona over at my house to welcome my friend, Federico Ardila, to the area!

If you're in the Los Ángeles area, join us at @hmc.edu for this year's Moody Lecture on September 16! This year's speaker is my dear friend and mentor, Federico Ardila-Mantilla.

For more information: www.hmc.edu/mathematics/...

#mathsky

Friends, the mathematics department @hmc.edu is looking to hire a new tenure-track operations researcher who would feel at home in our department. Please spread the word: math.hmc.edu/tenure-track...

We are hiring in Operations Research at @hmc.edu! If you or someone you know is on the job market, please consider applying: math.hmc.edu/tenure-track...

Prof. Andrés with group 1 of students.

Prof. Andrés with group 2 of students.

Today was our last day of our research experience and I am extremely proud of my summer research students @hmc.edu!

Group one (Tito Cuchilla ‘26, Joseph Hound @claremontgraduateu.bsky.social, Cole Plepel ‘27, Louis Ye ‘27)

Group two (Cameron Ake ‘28, Spencer Lewis ‘28, Amanda Louie ‘28)

Equivariant volumes of symmetric edge polytopes The symmetric edge polytope ($\mathrm{SEP}$) of a finite simple graph $G$ is a centrally symmetric lattice polytope whose vertices are defined by the edges of the graph. Among the information encoded ...

New preprint announcement! This is my FIRST paper with @hmc.edu students and a @claremontgraduateu.bsky.social grad student! Very proud of this paper and the students who worked with me this summer.

“Equivariant volumes of symmetric edge polytopes”
arxiv.org/abs/2507.18846

The Surprising Math and Physics behind the 2026 World Cup Soccer Ball Here’s how the new tetrahedron-based design for the “Trionda” soccer ball may affect next year’s big game

ok i am aggressively not a sports person, but this story by @dodecalemma.bsky.social is so cool! and the graphics were fun to work on :) www.scientificamerican.com/article/the-...

Squirrels LOVE octahedra.

What is your favorite shape & why? For HMC math prof
@arvm.bsky.social it's a permutahedron, a symmetrical, convex polytope that exhibits many special properties. Read more about Vindas Meléndez's favorite shape & the key it holds to big mathematical mysteries on @sciam.bsky.social. uqr.to/arvm-sm.

Yuan Zhou talks at the #mip2025 about how to estimate the solid angle of d-dimensional cones, which corresponds to the proportion of Rd occupied by them, and which does not has a known closed formula for d > 3.

1/N

Seems like today was a good day to be too busy to check social media during work hours

#MathSky there's a new online open-access (and free) journal for mathematics and fiber arts: Interlace. Now accepting manuscripts! Editors-in-Chief: sarah-marie belcastro and Carolyn Yackel. 🧶
www.interlace-journal.org

A New Definition of Pain FoxTrot by Bill Amend | May 4, 2025

Happy Star Wars day! May the Fourth be with you!
foxtrot.com/2025/05/04/a...

No, only in captivity.

Release Release_1_6_11 · 4ti2/4ti2 What's Changed .github/workflows/ci-sage.yml: Update, use passagemath, remove cygwin by @mkoeppe in #45 Modernize the build system / drop support for old toolchains by @orlitzky in #44 New Contr...

New release of 4ti2, the package for algebraic, geometric and combinatorial problems on linear spaces. This is a maintenance release with no new features.
github.com/4ti2/4ti2/re...
#FOSS #MathSky

The Ehrhart polynomial of a matroid specializes to the beta invariant We show that the linear coefficient of the Ehrhart polynomial of a matroid base polytope evaluated at $t-1$ is equal to, up to normalization, the $β$-invariant of the matroid. This yields a lattice-po...

New paper with awesome collaborators!
"The Ehrhart polynomial of a matroid specializes to the beta invariant" with Anastasia Chavez (SMC), Galen Dorpalen-Barry (Texas A&M), Luis Ferroni (IAS & UniPi), Fu Liu (UC Davis), and Felipe Rincón (QMUL). #mathsky
arxiv.org/abs/2504.15518

HMC mathematics professor @arvm.bsky.social has co-authored a paper on polynomial properties in polyhedral geometry. Read the full article about Vindas Meléndez's paper on the behavior of local h-polynomials on our news page. uqr.to/hmc-arvm.

Profs. @haydeelindo.bsky.social, @jamiehadd.bsky.social & Talithia Williams share the Institute for Data Science and Social Impact, which will foster interdisciplinary collaboration, advance data science research, & create pathways to apply data-informed methods to real-world issues. uqr.to/iap-dssi

HMC mathematics professor @jamiehadd.bsky.social has been awarded a CAREER grant from the NSF. The grant supports Haddock's desire to be a mentor and increase access in data science for groups that have been historically excluded from research mathematics. uqr.to/haddock-career.

Three actions of D₄: on itself by multiplication, on itself by conjugation, and on its subgroups by conjugation. Action graphs of each are shown.

This week, I recorded 4 new #VisualAlgebra YouTube videos on group actions. I heavily use the following concepts:

1. G-sets
2. Action graphs
3. Group switchboards
4. Fixed point tables.

Interested? I'll give you a preview here. Please share!

#MathSky 🧵👇1/16