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Updated: 2019-Jan-18 16:00 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 20 followers:

RIP Michael Atiyah. If you haven't yet, I recommend reading this wonderful @QuantaMagazine profile by @sioroberts:https://t.co/ECzmTYDyiZ

— Federico Ardila (@FedericoArdila) January 12, 2019

2. One retweet per 23 followers:

pi = 3.14159... while 22/7 = 3.14285... so 22/7 is bigger. But here's a cute proof that 22/7 is bigger.

— John Carlos Baez (@johncarlosbaez) January 11, 2019

The integral that gives 22/7 - pi is surprisingly elegant, and it's clearly positive since you're integrating a positive function. pic.twitter.com/Dj2HJMYRJD

3. One retweet per 41 followers:

The difference between the exponentials exp(A) - exp(B) of matrices A and B can be expressed concisely in terms of an integration involving their difference A - B. (The proof is one line!) #calculus #math pic.twitter.com/WXADR4N4By

— Sam Walters ☕️ (@SamuelGWalters) January 16, 2019

4. One retweet per 43 followers:

The gulf between words written on the spines of non-curriculum math books and curriculum math books speaks a painful volume to the almost unbridgeable chasm that exists between the freedom of mathematics and its incarceration as a "performing seal"... pic.twitter.com/qLjWLNA1JQ

— Sunil Singh (@Mathgarden) January 14, 2019

5. One retweet per 43 followers:

James Watson (as in Crick &) has been stripped of certain honours at a NY lab thx to comments about race and intelligence. If you're worried that he is simply stating uncomfortable truths, this great blog post should reassure you.https://t.co/2KOJGwgIC5

— Timothy Gowers (@wtgowers) January 13, 2019

6. One retweet per 44 followers:

著者がpdf他を公開しているようです．画面でみるのはok, 印刷は不可と．https://t.co/TViy6dl0FT https://t.co/amRxm09yN6

— Iwao KIMURA (@iwaokimura) January 14, 2019

7. One retweet per 50 followers:

Why is math such an important issues for social justice. @profnicolej says 1) it is weaponized against blacks 2) black children are disproportionately tracked into the lowest math, and #data4blacklives 1/2

— Dr. Diaz Eaton (@mathprofcarrie) January 12, 2019

8. One retweet per 63 followers:

The head of Harvard's astronomy department thinks that Oumuamua - the mysterious object that shot through our solar system in 2017- could be an alien probe. In this interview he explains why. I'd say it's a long shot, but very interesting.https://t.co/0ffLDhmAto

— John Carlos Baez (@johncarlosbaez) January 12, 2019

9. One retweet per 69 followers:

Oh dear, yet another mathematical giant has left us (after Peter Swinnerton-Dyer, Elias Stein and Jean Bourgain). He was also a former master of Trinity College Cambridge, and extraordinarily energetic right into his late 80s. https://t.co/JrAVBkGLdG

— Timothy Gowers (@wtgowers) January 11, 2019

10. One retweet per 74 followers:

If we try to extend the complex numbers the way we extended the reals to get the complexes, by adding more square roots of -1, we get the quaternions Q. The resulting differential calculus of quaternion functions fails some basic expectations. #algebra #math pic.twitter.com/ho4TRNL0jC

— Sam Walters ☕️ (@SamuelGWalters) January 12, 2019

11. One retweet per 76 followers:

this semester, i'll be teaching multivariable calculus @Penn to @PennEngineers as a flipped class, using the videos i've been posting at https://t.co/P42Q4GPVMw pic.twitter.com/KzvzFcaFDB

— robert ghrist (@robertghrist) January 15, 2019

12. One retweet per 77 followers:

Pablo Motos piensa que π es exactamente 3 y al que meten a la cárcel es a mí...

— Juan Miguel Ribera (@juanripu) January 11, 2019

Tiene bemoles la cosa.#MathematicalPride #MathTeacher

Imagen vía @juliomulero pic.twitter.com/27BireQwOy

13. One retweet per 87 followers:

Sorry to confirm that Sir Michael Atiyah has died today. It is hard to believe that such a force of nature, life, and mathematical creativity is gone. RIP. https://t.co/AHCdS9EfdG

— N. Ghoussoub (@NGhoussoub) January 11, 2019

14. One retweet per 93 followers:

Some materials (homework assignments, quizzes, midterm, a few other things) from the spring 2018 edition of my undergraduate course on networks: https://t.co/zd8XcsaVEM

— Mason Porter (@masonporter) January 15, 2019

I discuss the development, evolution, & philosophy of my course in this book chapter: https://t.co/tyyhBcrlPG

15. One retweet per 105 followers:

Dogs on leashes dragging their owners. Surely, this has nothing to do with maths! Well, if they are running along a line perpendicular to the initial direction of the leash, the owners will be dragged along a curve called tractrix.🐶 [Wiki https://t.co/vsVHvk2JyB] #50FamousCurves pic.twitter.com/PUZr63X7hF

— Tamás Görbe 🇭🇺🇬🇧🇪🇺 (@TamasGorbe) January 14, 2019

16. One retweet per 106 followers:

Ursula K. Le Guin vs. academia. "I have never in my life been so honored as I was on those frigid Rochester evenings when Ursula K. Le Guin told a department chair that if he wanted her attention, he’d have to ask permission from the freshman" https://t.co/hJJ8dkvio1

— Dr. Izabella Laba (@ilaba) January 11, 2019

17. One retweet per 108 followers:

En Dolores, un cabo de policía junto con otra persona provocó la muerte de un sospechoso de hurto, que era inocente. Hay medios que titularon “justicia por mano propia”.

— Jana Rodriguez Hertz 汉娜 (@janarhertz) January 12, 2019

No es “justicia”.

Los medios tienen responsabilidades sociales, por favor

18. One retweet per 114 followers:

At #JMM2019 this week, NAM and NSA will host a Town Hall Meeting on the Status of the African Diaspora in the Mathematical Sciences. It will take place on Thursday January 17 at 5:30 PM in Room 316 of the Baltimore Convention Center. https://t.co/qUdcQ6V2CW pic.twitter.com/IhnJSeoCXW

— Edray Herber Goins (@edraygoins) January 14, 2019

19. One retweet per 118 followers:

Uyen Nguyen's stunning origami designs at the #JMM2019 Art Exhibition. pic.twitter.com/wUEHsAtv7F

— Robert (Bob) Bosch (@baabbaash) January 16, 2019

20. One retweet per 128 followers:

“Post-purchase monetization” is a demon-phrase that needs to go back to whatever Mt. Doom MBA school created it. https://t.co/CswuJhAEMC

— Rachel Traylor (@Mathpocalypse) January 14, 2019