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Updated: 2019-Sep-16 15:10 UTC. Listed tweets: 20. Based on tweets of Mathematicians on Twitter. Feedback: @TrueSciPhi.

Mathematicians' tweets from past 7 days most retweeted *per follower*:

1. One retweet per 33 followers:

{\__/}

— Mark C. (@LargeCardinal) September 11, 2019

( • . •)

/ >💻 yes, I can tell you much about cybersecurity

{\__/}

( • - •)

💻< \ wait, you want to do what to your ex's facebook? https://t.co/ZvBGyP6iCP

2. One retweet per 41 followers:

The Thurston geometry not tweeted yet... Life on (not in) a spherinder. In this geometry, a small brick, when watched from a specific location, will look like a huge ring around you... more precisely, not one ring, but a series of concentric rings!https://t.co/r745yLpHhD pic.twitter.com/PhBeVi5uSK

— Zeno Rogue (@ZenoRogue) September 10, 2019

3. One retweet per 44 followers:

Gripping gears: two gears mesh with and rotate around each other, with no axles and no frame. Joint work with @willsegerman and @Sabetta_. Full video at https://t.co/YRbcjmfl2b pic.twitter.com/h8d6HQYHj1

— Henry Segerman (@henryseg) September 14, 2019

4. One retweet per 48 followers:

New tenure-track position open for asst prof in math at @harveymudd -- about one more month before the committee starts reading applications! Please pass the word! https://t.co/Djxwtz6Qok (open field, priority for #datasci)

— Darryl Yong (@dyong) September 11, 2019

5. One retweet per 56 followers:

In the static regime, the electric / magnetic fields generated by point sources is the superposition of radial monopoles / dipoles. https://t.co/P427gY1dQE pic.twitter.com/GCnqyvZPhH

— Gabriel Peyré (@gabrielpeyre) September 10, 2019

6. One retweet per 82 followers:

A short thread on jobs advertised in the Faculty of Science @durham_uni where I will be starting as Executive Dean in January. Come join me!

— Jacqui Ramagge (@jacquiavelli) September 11, 2019

7. One retweet per 85 followers:

The Brachistochrone problem was solved by Bernoulli and is the birth of calculus of variations. https://t.co/FruykhAkmj https://t.co/TxykJLkQhl pic.twitter.com/g6FY6u6riZ

— Gabriel Peyré (@gabrielpeyre) September 14, 2019

8. One retweet per 89 followers:

Let me share some illustrations I've recently created to discuss the topic:

— Joel David Hamkins (@JDHamkins) September 10, 2019

What is a number?

Two sets are equinumerous—they have the

same cardinal size—when they can be placed into a one-to-one correspondence, like the shepherd counting his sheep off on his fingers. pic.twitter.com/qYtNqkx13I

9. One retweet per 105 followers:

20 years of @MitacsCanada : my article in the September 2019 Notices of the @amermathsoc recounts the story of the innovation platform launched by the Canadian mathematics community through their institutes: @CRM_Montreal @pimsmath @FieldsInstitute https://t.co/SO0iJ8w2HA pic.twitter.com/re398MC593

— Alejandro Adem (@alejandroadem) September 10, 2019

10. One retweet per 120 followers:

Domino Chain Reaction

— Tamás Görbe (@TamasGorbe) September 14, 2019

A domino can knock over a bigger/scaled-up version of itself. The maximum scaling factor is around 2.

Start with a domino of height 5 cm and use 1.5 for scaling-up. How many dominoes do we need to reach a height of 100 meters?

Source: Stephen Morris pic.twitter.com/NBhyfKBFDn

11. One retweet per 121 followers:

El #HypnoMaths se nos ha ido de las manos...#AugmentedReality #MathLife #MathTeacher https://t.co/3P6nRAqNpa

— Juan Miguel Ribera (@juanripu) September 13, 2019

12. One retweet per 127 followers:

Principal component analysis and non-negative matrix factorization are two particular cases of non-convex matrix factorization problems. They differ by the constraints on the atoms D and coefficients X. https://t.co/TAWN786Qq0 https://t.co/knuRHQNlNG pic.twitter.com/f7AvXgIozA

— Gabriel Peyré (@gabrielpeyre) September 16, 2019

13. One retweet per 137 followers:

Limit that I stumbled into in some calculations. (Where big Gamma here is the classical Gamma function.) #math #calculus pic.twitter.com/E1ja9qe9Ap

— Sam Walters ☕️ (@SamuelGWalters) September 13, 2019

14. One retweet per 140 followers:

HyperRogue 11.2: Thurston geometries (free update!)https://t.co/uaNQ5MgmiC pic.twitter.com/TpWSBZkaVa

— Zeno Rogue (@ZenoRogue) September 13, 2019

15. One retweet per 148 followers:

Tip 1 if you're applying for a #postdoc (or any job!)

— Paul Macklin (@MathCancer) September 9, 2019

A generic cover letter doesn't help much. Don't tell me you want a job. Show me why you want *this* job.

What interests you about *this job*? Do you understand what we do? How will you contribute? How I can help you grow?

16. One retweet per 154 followers:

Simple example showing how the tensor product is the natural extension of the Cartesian product A x B for sets to vector spaces of functions. Here, it is illustrated for finite sets, though it can be appropriately extended to general locally compact spaces. #algebra #math pic.twitter.com/PBPliDsoKF

— Sam Walters ☕️ (@SamuelGWalters) September 14, 2019

17. One retweet per 155 followers:

The @ICERM exhibits for Illustrating Mathematics are starting to appear! pic.twitter.com/nuPSYJLpmU

— Laura Taalman (@mathgrrl) September 9, 2019

18. One retweet per 164 followers:

Inside every dull gray cube there's a colorful dodecahedron yearning to unfold!

— John Carlos Baez (@johncarlosbaez) September 15, 2019

The dodecahedron doesn't fill the whole cube. Only about 80.9%. But that's the golden ratio (sqrt(5)+1)/2 divided by 2, so we shouldn't complain.

Animation by Hermann Serras. (1/2) pic.twitter.com/aiqO80OuVI

19. One retweet per 167 followers:

When I spotted @kimjoyskitchen recipe @guardian for mango tart with geometric fruit pieces, the mathematician in me couldn’t resist doing my own symmetrical version pic.twitter.com/sLtPiMjOt7

— Marcus du Sautoy (@MarcusduSautoy) September 14, 2019

20. One retweet per 181 followers:

The barista at my neighborhood coffee shop just told me he thinks math is the “humanities of the sciences.”

— Kelsey Houston-Edwards (@KelseyAHE) September 15, 2019