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Updated: 2018-May-22 13:48 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 39 followers:

Suppose that g:R -> R is a continuous function on the reals such that g(2x) = 2g(x) for all x. Does it follow that g(3x) = 3g(x) for all x? #math

— Sam Walters ☕️ (@SamuelGWalters) May 18, 2018

2. One retweet per 53 followers:

お，強い主張だ．「「外部人材の理事」や「実務経験のある教員による科目」を一定割合以上にするよう要件を設けた。」に対して「支離滅裂で議論に値しない」（電気通信大）| 高等教育無償化：政府の要件７割反対 国立大「筋通らず」 - 毎日新聞 https://t.co/NKJZO7jwAd

— Iwao KIMURA (@iwaokimura) May 17, 2018

3. One retweet per 57 followers:

In my new Mathematical Enchantments post, I talk about four-dimensional space, which is sort of like three-dimensional space, only spacey-wacey-er. Lots of pictures! https://t.co/dQI79MUyWP pic.twitter.com/wHvNH8yNfh

— James Propp (@JimPropp) May 17, 2018

4. One retweet per 87 followers:

— Olivia Walch (@oliviawalch) May 18, 2018

5. One retweet per 90 followers:

Mind-blowing science in a mere "remark". "Frobenius manifolds" show up in topological string theory. Now arXiv:1805.02286 shows that at each point of such a manifold there's sitting an automaton - a probabilistic finite-state machine. Zounds! pic.twitter.com/WchPVbjcTN

— John Carlos Baez (@johncarlosbaez) May 16, 2018

6. One retweet per 92 followers:

My book with @JacobBiamonte is out! Learn how quantum ideas like Feynman diagrams can be applied to population biology! Learn how Petri nets let you do computation with chemistry! Plus, it's got a cartoon of me pulling a rabbit out of a hat. https://t.co/gxXYKl4Eo7 pic.twitter.com/T2OKHDkjwn

— John Carlos Baez (@johncarlosbaez) May 17, 2018

7. One retweet per 101 followers:

1³+2³+3³+4³ = (1+2+3+4)³#DemostracionesVisuales #HypnoMaths https://t.co/mthqUPSshQ

— Juan Miguel Ribera (@juanripu) May 20, 2018

8. One retweet per 104 followers:

Liouville's Theorem tells us when an integral is not elementary. For example, it shows why the indefinite integral of functions like exp(x^2) are not expressible in terms of the elementary functions of #calculus. #math pic.twitter.com/O8XLrzwlJe

— Sam Walters ☕️ (@SamuelGWalters) May 15, 2018

9. One retweet per 110 followers:

"Es más importante enseñar a los niños a pensar y a ser críticos que a saber dividir." ~ @ClaraGrima https://t.co/9vhN3bTGtI

— Daniel Ruiz Aguilera (@druizaguilera) May 20, 2018

10. One retweet per 111 followers:

On my blog Matteo Polettini explains "effective" thermodynamics, where we only know _some_ of what's flowing into or out of an open system. In reality all systems are open, and we never have complete knowledge of inflows our outflows, so this is big: https://t.co/zWmhcfbSzH pic.twitter.com/t6t6kpzbXi

— John Carlos Baez (@johncarlosbaez) May 18, 2018

11. One retweet per 118 followers:

Here's a math riddle for your Friday:

— Kelsey Houston-Edwards (@KelseyAHE) May 18, 2018

(I heard it last week from a visiting mathematician and had fun thinking about it.) pic.twitter.com/Kzc5v7rf0G

12. One retweet per 123 followers:

We often ignore the side-effects of what we do, like the "waste" shown in red here. That's one reason we're in trouble. But category theory can make this process of ignoring into a functor! Then, left and right adjoints can help us "un-ignore": https://t.co/wUhc3YjKds pic.twitter.com/4Zp0B9gsoz

— John Carlos Baez (@johncarlosbaez) May 21, 2018

13. One retweet per 130 followers:

The Dirac current is a very basic quantity in #quantum field theory since it gives interactions between particles/fields. Here is an example that hopefully motivates why it is as it's often written. (The conjugation here is the Dirac conjugate.) #physics #math pic.twitter.com/OJ83Kgl2TG

— Sam Walters ☕️ (@SamuelGWalters) May 19, 2018

14. One retweet per 135 followers:

There is a crucial place for ugly mathematics. It can often be necessary on the journey to beautiful mathematics. Let’s not hide the struggle from our students lest they consider themselves not up to the task when they can’t create beauty with a first (or second) attempt. https://t.co/HWQDs024pG

— Amie Albrecht (@nomad_penguin) May 21, 2018

15. One retweet per 139 followers:

1限の線形代数で正規直交基底を導入し，

— Iwao KIMURA (@iwaokimura) May 15, 2018

「漢字がごついのでON基底と略します，王・長嶋ではないですよ，でも何のことかわかります？」

みたいな話をしてました．

16. One retweet per 146 followers:

“Lessons from Math Degree That Have Nothing to do with Math”. Item 6 breaks my heart a little, but I love the overall message. https://t.co/7nDeMJPvaa @mathblogging #mbpick

— Dana C. Ernst (@danaernst) May 16, 2018

17. One retweet per 149 followers:

Nice to see my friend @carlorovelli's new book on the nature of time comes in an audiobook version read by... Benedict Cumberbatch! Rovelli is right, the coolest discovery of 20th-century physics is that "now" has no absolute meaning.https://t.co/5KIneEypJv pic.twitter.com/B9iyWMVSi3

— John Carlos Baez (@johncarlosbaez) May 19, 2018

18. One retweet per 190 followers:

Mathematical pet peeve: When news sources use “exponentially” when they really mean “substantially”, e.g. traffic

— Kate Owens (@katemath) May 15, 2018

19. One retweet per 198 followers:

Fantastic perspective by @ruth_baker and colleagues on the complementary roles of mechanistic modeling and machine learning:

— Paul Macklin (@MathCancer) May 18, 2018

Mechanistic models versus machine learning, a fight worth fighting for the biological community?https://t.co/0d0m1NsPf4

20. One retweet per 201 followers:

In #Aachen sind die Kennzeichen alle pic.twitter.com/XTC3hYYUy1

— Marco Lübbecke (@mluebbecke) May 19, 2018