1/ recently, the @jm_collective and others have been pushing for mathematicians (& the @amermathsoc) to cut ties with the NSA (@NSAGov).
i would like to comment on that.
2/ i begin by affirming their right (& everyone’s right) to free speech & expression of beliefs, political or other. go for it & sign whatever petitions you want. make your arguments & let us all listen.
3/ i disagree with their stance and recommendations. specifically, they have urged people not only not to work with the NSA (okay, that’s your choice), but to actively punish students by refusing to write letters of recommendation should they choose to apply to the NSA.
4/ they do so after acknowledging that the NSA is the #1 employer of math phds. in so doing, they are not merely declining to work with the NSA (as is their individual prerogative), but actively working to sabotage employment of young people in math.
i think that’s wrong.
5/ just the NSA? nope. the fine print says no military agencies at all. no @DARPA, no @AFOSR, no @USNavyResearch, nothing – all of which have long supported mathematics research & supported mathematicians. i would not be where i am without their support.
6/ sadly, they imply that a mathematician cannot be a “true ally” working towards the goals of diversity, inclusion, & equity if they have any connection to the @NSAGov, etc. this is dismissive of we who strive for div/incl/eq via teaching, mentoring, & more.
7/ the entire tone of their arguments is – to my ears – akin to certain religious sects who declare that the unsaved are incapable of doing any good and that association implies guilt and merits the ostrakon.
8/ furthermore, disagreement is a sure sign of a witch or being pro-witch (updated to these modern days). that is the argument of an inquisitor.
9/ the cherry on top – after declaring certain branches of the USGov as being unclean, they call for increased funding for mathematicians from the @NSF. why? why not be pure and renounce all US government funding?
10/ let’s continue: are those tuition dollars you pocket coming from people whose political opinions you embrace? tainted. does your work benefit corporations or universities whose priorities do not match yours? if association is guilt, well… the monastery awaits.
11/ and to be hyperbolic (& with apologies to st. paul), perhaps you should go all the way and renounce all technology derived from military funding for mathematics, to be consistent.
#goodluckwiththat
12/ i’ve been critical, and may be criticized in return: so be it. if you have arguments i'll listen. but i’m going to write letters for my students to work at NSA/Goldman/Simons/Satan-Inc or anywhere willing to hire mathematicians.
i affirm my students' right to choose.
end note: i have never worked for the NSA nor received funding from them. my research has been funded continually by the @DeptofDefense since 2005. i’m proud of my country & am happy to serve, despite its many faults.
i believe in supporting math research, period.

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More from @robertghrist

28 Jul 20
a quick thread on what the @penn mathematics department is doing starting this fall to improve the student experience in calculus courses...
1/
of course, this is motivated by the pandemic and the need for online instruction; however, this is not a hackjob emergency plan. these reforms are more structural and sustainable, and have been in the works for some time.
2/
summary, first; details, following:
-> all lectures via short asynchronous vids
-> all "in class" time is active learning
-> no more midterms; weekly quizzes
-> no more $200 textbook/mymathlab
-> all homeworks online via canvas
-> no more 8am recitations
3/
Read 14 tweets
15 Jul 20
what ties together machine learning, rational homotopy theory, rough paths, lie groups, topological data analysis, and how to teach undergraduate vector calculus?
a thread…
1/
this is a long, paper-laden thread that sets up a new paper with darrick lee, a ph.d. student at @Penn in applied mathematics. buckle up!
arxiv.org/abs/2007.06633
2/
our story begins in the 1990’s: t. lyons [oxford] develops a fantastic set of tools for working with *rough paths* in stochastic differential equations, launching a formidable set of theory and applications.
en.wikipedia.org/wiki/Rough_path
3/
Read 20 tweets
9 Jul 20
a technical thread for a technical paper:
"Cellular sheaves of lattices & the Tarski Laplacian"
with @hansmriess
arxiv.org/abs/2007.04099
1/
here's the setup: cellular sheaves are data structures over a cell complex (such as a social or neural network) that attach algebraic data to nodes, edges, etc.
they are wonderful mathematical entities.
2/
a sheaf of vector spaces has vector spaces atop cells, with dimensions varying from cell-to-cell.
these are all glued together by a network of linear transformations, respecting the base structure (cf., the adjacency matrix of the network)
3/
Read 18 tweets
6 Jul 20
i get a lot of questions about how to make math vids...
my workflow is so byzantine, it's not worth writing up.
but...for those making vids for fall semester in a hurry: a thread of advice...
/1
for quick lo-rez vids, you do not want to stand in front of a camera or be filmed at a board. nononono...
write on paper or a digital pad, and then do voiceover.
splice in visualizations if you got 'em.
that's the basic winning formula.
/2
equipment:
1) wacom tablet or ipad (i don't apple...)
2) software to capture digital pen motion with pressure sensitivity (i use @ScrbleApp)
3) software to do screencap vids (i use @snagitapp)
4) audio recording software +
5) video compositing software (both @creativecloud)
/3
Read 9 tweets
2 May 20
one of the things i did this semester in my multivariable calculus class was to give the option of doing an "extra credit" project. i've never done that before, and was inclined against it. but: it went so very well. let me tell you...
1/
ground rules: you do the project because you want to learn more than what we cover in class. it counts for an unspecified amount of bonus credit if done well. no rules on format (essay? video? comic book? yay!), but you have to explain what you learned well.
2/
to give students a starting point, i made a list of various "bonus videos" from my lectures in the Calculus BLUE video text on YouTube & suggested they pick one of those to get started.
3/
Read 6 tweets
20 Jan 20
henry wente: geometer & teacher.
he left this world today: 20-jan-2020.
he's the reason i'm a mathematician.
i was an engineering undergraduate at the university of toledo, ohio, in 1987. i had AP calculus in high school, but there was an "honors calculus 1 for engineers" course, so i signed up for that. the teacher was *so* *weird*.
his name was dr. wente.
he was socially awkward in that clearly-brilliant way.
we just all thought he was weird.
then, one day, there was an announcement for a research talk in the math department that had a funny picture:
(image credit math.uni-tuebingen.de/user/nick/gall…)
Read 12 tweets

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