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Updated: 2020-Jan-25 14:37 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 4 followers:

i solved my maths basically.

— Use @edsouthall (@solvemymaths) January 21, 2020

2. One retweet per 17 followers:

Here it is. #DisruptJMM https://t.co/DdGBGsLBKe pic.twitter.com/pIPCd6Nu9s

— Dr. Wandering Point (@WanderingPoint) January 18, 2020

3. One retweet per 53 followers:

If you take any real number and repeatedly applying the cosine to it, the result always converges to the same constant (0.73908...). This problem shows that the convergence is fast enough that the differences add up to some differentiable function. #calculus #Math pic.twitter.com/8scsuWldTV

— Sam Walters ☕️ (@SamuelGWalters) January 18, 2020

4. One retweet per 58 followers:

Want to try this again - please RT for reach:

— Mark C. (@LargeCardinal) January 21, 2020

Alice is looking at Bob. Bob is looking at Chris. Alice is standing. Chris is not standing.

Question: Is someone who is standing looking at someone who is not standing?

The answer will follow :P curious how people approach this.

5. One retweet per 73 followers:

Burgers’s equation is one of the simplest non-linear partial differential equation, with solutions exhibiting shocks. https://t.co/1oKcPgiNBe pic.twitter.com/GFGVgx0FZt

— Gabriel Peyré (@gabrielpeyre) January 19, 2020

6. One retweet per 84 followers:

Some abstract theorems can be used as tools to simplify matrices to practical ends. Here is an example utilizing the beautiful result on the polynomial algebra K[x] being a PID (principal ideal domain) for any field K - leading to the Jordan canonical form. #algebra #math pic.twitter.com/V8nxn8nzh5

— Sam Walters ☕️ (@SamuelGWalters) January 19, 2020

7. One retweet per 84 followers:

La actriz, inventora e ingeniera de telecomunicaciones Hedy Lamarr (1914-2000) falleció hoy hace 20 años.

— Marta Macho Stadler (@MartaMachoS) January 19, 2020

Junto al compositor George Antheil, inventó una primera versión del espectro ensanchado. https://t.co/EDdSSL8yl5

8. One retweet per 91 followers:

Good snow day for a Tinker Box to arrive in the mail. Double pendulum (chaotic) with LED shining on a glow board. Hours of fun! pic.twitter.com/SsT1hQuboY

— Alex Kontorovich (@AlexKontorovich) January 19, 2020

9. One retweet per 92 followers:

— ∞-Homo(A,B) (@Category_Fury) January 19, 2020

10. One retweet per 115 followers:

Basic Abstract Algebra: Groups

— ∞-Homo(A,B) (@Category_Fury) January 19, 2020

So, last we left off we discussed sets and monoids. Monoids will be our jumping off point in discussing groups! So, a group is a set with a binary operation that is associative and unital, as monoids are. (1/12)

11. One retweet per 120 followers:

A binomial sum identity I came across in some calculations today. #math pic.twitter.com/nKLErYPOcQ

— Sam Walters ☕️ (@SamuelGWalters) January 24, 2020

12. One retweet per 123 followers:

Re-sharing as #DisruptJMM fades & #DisruptMath emerges!

— Benjamin Dickman (@benjamindickman) January 19, 2020

Direct link to #DisruptMaths presentation [#TMCNYC19]:

👉https://t.co/wvGktBHnDU

Hoping the mathematical `Disruption` cuts across pre-K to 12 as well as post-secondary and other mathematical spaces.

[#MTBoS + #iTeachMath] https://t.co/Z1dFQq8KgK

13. One retweet per 123 followers:

Veterans with traumatic brain injuries (TBIs) can have constant pain & reduced cognitive function. I wrote the law to improve care for service members with TBIs & am disgusted the president would trivialize these severe injuries. Our troops deserve better. https://t.co/dWTdZHtGHQ

— Jerry McNerney (@RepMcNerney) January 22, 2020

14. One retweet per 124 followers:

Entropy is the amount of information you don't have about the random details of a system: what you'd need to describe those details.

— John Carlos Baez (@johncarlosbaez) January 19, 2020

It takes 500 zettabytes to fully describe a gram of liquid water, but a manageable amount per molecule!

(1/n) pic.twitter.com/cDg7ZFpLt3

15. One retweet per 124 followers:

I know, *everyone* is hiring for machine learning these days. It is OK if you like this, but if you still love (like me) (a) good old fashioned computational integer linear programming and (b) teaching, write me an email; we are hiring PhDs/postdocs @OR_RWTH #orms

— Marco Lübbecke (@mluebbecke) January 23, 2020

16. One retweet per 129 followers:

A mixture of Gaussians model can be represented as a weighted points cloud (actually a measure) over the mean/covariance domain. Mixture fitting is a non-convex optimization problem. https://t.co/zuaAu2GwcR pic.twitter.com/PFAesnpfko

— Gabriel Peyré (@gabrielpeyre) January 23, 2020

17. One retweet per 130 followers:

Presentació de la cloenda de la Jornada d'Educació Matemàtica d'ahir:

— Daniel Ruiz Aguilera (@druizaguilera) January 19, 2020

"Materials manipulatius, un camí cap a l'abstracció"

https://t.co/jqOmxiQWaq #jemtorrent #iteachmath #matxat pic.twitter.com/MGnGv6UbBc

18. One retweet per 141 followers:

— Amie Albrecht (@nomad_penguin) January 19, 2020

19. One retweet per 141 followers:

√2 is irrational ≡ there’s no isosceles right triangle with integer sides pic.twitter.com/7SZh69Rx8X

— Tamás Görbe (@TamasGorbe) January 18, 2020

20. One retweet per 144 followers:

Tiling a 16x16 board, with one unit removed, using L shaped tiles. Recursively divide into four smaller boards, place the tile on those not containing the omitted square. This reduces to four smaller instances of the problem. Works with any square board of size 2^n. pic.twitter.com/jyUmJtLlzH

— Joel David Hamkins (@JDHamkins) January 21, 2020