benjamin dickman
@benjamindickman.bsky.social
K-12 math educator 🪄♾️
Brookline to Nanjing to NYC
Amherst College BA
Fulbright Program x2 (🇨🇳+🇵🇭)
Teachers College, Columbia University PhD
past BU Wheelock (postdoc, Math Edu)
cocreated original word game: #FiddleBrix
http://tinyurl.com/bmdmaths
Brookline to Nanjing to NYC
Amherst College BA
Fulbright Program x2 (🇨🇳+🇵🇭)
Teachers College, Columbia University PhD
past BU Wheelock (postdoc, Math Edu)
cocreated original word game: #FiddleBrix
http://tinyurl.com/bmdmaths
Pinned
it's out! ♾️
link.springer.com/chapter/10.1...
[my grad school alum access let me download the entire book]
and thru a slight stretch of the imagination, my participation in the conclusion* makes me a coauthor w Tara J. Yosso (whose work i think is great!)
*link:
link.springer.com/chapter/10.1...
link.springer.com/chapter/10.1...
[my grad school alum access let me download the entire book]
and thru a slight stretch of the imagination, my participation in the conclusion* makes me a coauthor w Tara J. Yosso (whose work i think is great!)
*link:
link.springer.com/chapter/10.1...
Reposted by benjamin dickman
see also:
the new TODOS Position Statement!
it can be found here:
www.todos-math.org/wp-content/u...
cc. #iTeachMath ♾️ #MathSky 🧮
—
Writing Team
Lead Author:
Kokka
Contributing Authors (listed alphabetically by last name):
Dunleavy
Fulmore
Kwun
Lindfors-Navarro
Warburton
the new TODOS Position Statement!
it can be found here:
www.todos-math.org/wp-content/u...
cc. #iTeachMath ♾️ #MathSky 🧮
—
Writing Team
Lead Author:
Kokka
Contributing Authors (listed alphabetically by last name):
Dunleavy
Fulmore
Kwun
Lindfors-Navarro
Warburton
February 6, 2026 at 7:26 PM
see also:
the new TODOS Position Statement!
it can be found here:
www.todos-math.org/wp-content/u...
cc. #iTeachMath ♾️ #MathSky 🧮
—
Writing Team
Lead Author:
Kokka
Contributing Authors (listed alphabetically by last name):
Dunleavy
Fulmore
Kwun
Lindfors-Navarro
Warburton
the new TODOS Position Statement!
it can be found here:
www.todos-math.org/wp-content/u...
cc. #iTeachMath ♾️ #MathSky 🧮
—
Writing Team
Lead Author:
Kokka
Contributing Authors (listed alphabetically by last name):
Dunleavy
Fulmore
Kwun
Lindfors-Navarro
Warburton
see also:
the new TODOS Position Statement!
it can be found here:
www.todos-math.org/wp-content/u...
cc. #iTeachMath ♾️ #MathSky 🧮
—
Writing Team
Lead Author:
Kokka
Contributing Authors (listed alphabetically by last name):
Dunleavy
Fulmore
Kwun
Lindfors-Navarro
Warburton
the new TODOS Position Statement!
it can be found here:
www.todos-math.org/wp-content/u...
cc. #iTeachMath ♾️ #MathSky 🧮
—
Writing Team
Lead Author:
Kokka
Contributing Authors (listed alphabetically by last name):
Dunleavy
Fulmore
Kwun
Lindfors-Navarro
Warburton
February 6, 2026 at 7:26 PM
see also:
the new TODOS Position Statement!
it can be found here:
www.todos-math.org/wp-content/u...
cc. #iTeachMath ♾️ #MathSky 🧮
—
Writing Team
Lead Author:
Kokka
Contributing Authors (listed alphabetically by last name):
Dunleavy
Fulmore
Kwun
Lindfors-Navarro
Warburton
the new TODOS Position Statement!
it can be found here:
www.todos-math.org/wp-content/u...
cc. #iTeachMath ♾️ #MathSky 🧮
—
Writing Team
Lead Author:
Kokka
Contributing Authors (listed alphabetically by last name):
Dunleavy
Fulmore
Kwun
Lindfors-Navarro
Warburton
413 YKTV 🗣️
You’re looking at your 2026 Cecil Memorial Lecture speaker at Smith College!
Grateful for the opportunity to speak to young people and those who uplift them about these times of peril and hope.
Let’s get into it!
Grateful for the opportunity to speak to young people and those who uplift them about these times of peril and hope.
Let’s get into it!
February 5, 2026 at 1:25 AM
413 YKTV 🗣️
in #MathsToday, i asked students whether a collection of sequences are arithmetic, geometric, both, or neither:
one of the examples:
6, -12, __, -48, __, …
one of the examples:
6, -12, __, -48, __, …
February 4, 2026 at 4:03 PM
in #MathsToday, i asked students whether a collection of sequences are arithmetic, geometric, both, or neither:
one of the examples:
6, -12, __, -48, __, …
one of the examples:
6, -12, __, -48, __, …
"The team of part-time curriculum developers will be part of BEAM's Curriculum and Design Team."
Read more about this part time decision to engage with BEAM! Please share with others for whom it seems appropriate:
job-boards.greenhouse.io/beam/jobs/46...
s/o @mpershan.bsky.social
—
#iTeachMath ♾️!
Read more about this part time decision to engage with BEAM! Please share with others for whom it seems appropriate:
job-boards.greenhouse.io/beam/jobs/46...
s/o @mpershan.bsky.social
—
#iTeachMath ♾️!
Curriculum Developer, Deep Thinking in Mathematics Major
NYC or LA
job-boards.greenhouse.io
February 3, 2026 at 8:57 PM
"The team of part-time curriculum developers will be part of BEAM's Curriculum and Design Team."
Read more about this part time decision to engage with BEAM! Please share with others for whom it seems appropriate:
job-boards.greenhouse.io/beam/jobs/46...
s/o @mpershan.bsky.social
—
#iTeachMath ♾️!
Read more about this part time decision to engage with BEAM! Please share with others for whom it seems appropriate:
job-boards.greenhouse.io/beam/jobs/46...
s/o @mpershan.bsky.social
—
#iTeachMath ♾️!
Reposted by benjamin dickman
broke: retweets ≠ endorsements
woke: RT ≠ e
bespoke: ✓ ≠ Σ1/n!
woke: RT ≠ e
bespoke: ✓ ≠ Σ1/n!
January 29, 2026 at 12:24 AM
broke: retweets ≠ endorsements
woke: RT ≠ e
bespoke: ✓ ≠ Σ1/n!
woke: RT ≠ e
bespoke: ✓ ≠ Σ1/n!
"Further research is encouraged, especially in the context of cesarean matrices and post-partum group theory."
www.obstetricgynecoljournal.com/index.php/cj...
👁️👄👁️
www.obstetricgynecoljournal.com/index.php/cj...
👁️👄👁️
Obstetric Paradoxes and Didactic Equations: The Impact of Mathematical Teaching on Childbirth and Beyond
www.obstetricgynecoljournal.com
February 1, 2026 at 8:30 PM
"Further research is encouraged, especially in the context of cesarean matrices and post-partum group theory."
www.obstetricgynecoljournal.com/index.php/cj...
👁️👄👁️
www.obstetricgynecoljournal.com/index.php/cj...
👁️👄👁️
Is "cancellation" possible for the Choose function?
For example, is this true?
Choose(ap,bp) = Choose(a,b)
lol no, not in general
But! mod p where p is prime? Yes!
Also true mod p^2
Amazingly, it still seems true mod p^3 (need p>5)
Experiment!:
www.wolframalpha.com/input?i=Mod%...
#iTeachMath ♾️
For example, is this true?
Choose(ap,bp) = Choose(a,b)
lol no, not in general
But! mod p where p is prime? Yes!
Also true mod p^2
Amazingly, it still seems true mod p^3 (need p>5)
Experiment!:
www.wolframalpha.com/input?i=Mod%...
#iTeachMath ♾️
February 1, 2026 at 6:22 PM
Is "cancellation" possible for the Choose function?
For example, is this true?
Choose(ap,bp) = Choose(a,b)
lol no, not in general
But! mod p where p is prime? Yes!
Also true mod p^2
Amazingly, it still seems true mod p^3 (need p>5)
Experiment!:
www.wolframalpha.com/input?i=Mod%...
#iTeachMath ♾️
For example, is this true?
Choose(ap,bp) = Choose(a,b)
lol no, not in general
But! mod p where p is prime? Yes!
Also true mod p^2
Amazingly, it still seems true mod p^3 (need p>5)
Experiment!:
www.wolframalpha.com/input?i=Mod%...
#iTeachMath ♾️
2026 Summer Math in the Mountains [MitM] link just dropped:
docs.google.com/document/d/1...
docs.google.com/document/d/1...
February 1, 2026 at 2:50 AM
2026 Summer Math in the Mountains [MitM] link just dropped:
docs.google.com/document/d/1...
docs.google.com/document/d/1...
when students get stuck on a Calc problem for which u substitution would be a reasonable and productive strategy, i simply leave a note that says "no u"
January 29, 2026 at 12:25 AM
when students get stuck on a Calc problem for which u substitution would be a reasonable and productive strategy, i simply leave a note that says "no u"
broke: retweets ≠ endorsements
woke: RT ≠ e
bespoke: ✓ ≠ Σ1/n!
woke: RT ≠ e
bespoke: ✓ ≠ Σ1/n!
January 29, 2026 at 12:24 AM
broke: retweets ≠ endorsements
woke: RT ≠ e
bespoke: ✓ ≠ Σ1/n!
woke: RT ≠ e
bespoke: ✓ ≠ Σ1/n!
Infinite Pancakes, Anyone?
www.nytimes.com
January 27, 2026 at 4:30 AM
some shapes to #noticewonder amid the current winter storm
top: table and chair, all snow
bottom: add some freezing rain
how would you name the shapes you see?
photo credit:
me & my patio furniture!
top: table and chair, all snow
bottom: add some freezing rain
how would you name the shapes you see?
photo credit:
me & my patio furniture!
January 25, 2026 at 10:26 PM
some shapes to #noticewonder amid the current winter storm
top: table and chair, all snow
bottom: add some freezing rain
how would you name the shapes you see?
photo credit:
me & my patio furniture!
top: table and chair, all snow
bottom: add some freezing rain
how would you name the shapes you see?
photo credit:
me & my patio furniture!
we love a resource drop!
Science teachers. If you haven't seen it before, this link contains pretty much all the resources you will ever need. 1000s of files.
#iTeachPhysics
#Science 🧪
drive.google.com/drive/folder...
#iTeachPhysics
#Science 🧪
drive.google.com/drive/folder...
January 25, 2026 at 8:54 PM
we love a resource drop!
there are perfect squares that can be "concatenated" to form other perfect squares; for example:
4 and 9 yield 49
16 and 9 yield 169
allowing leading zeros:
9 and 025 yield 9025
can you state and prove... anything about such numbers?
infinitely many? criteria to form squares? etc!
#iTeachMath ♾️
4 and 9 yield 49
16 and 9 yield 169
allowing leading zeros:
9 and 025 yield 9025
can you state and prove... anything about such numbers?
infinitely many? criteria to form squares? etc!
#iTeachMath ♾️
January 24, 2026 at 4:02 PM
there are perfect squares that can be "concatenated" to form other perfect squares; for example:
4 and 9 yield 49
16 and 9 yield 169
allowing leading zeros:
9 and 025 yield 9025
can you state and prove... anything about such numbers?
infinitely many? criteria to form squares? etc!
#iTeachMath ♾️
4 and 9 yield 49
16 and 9 yield 169
allowing leading zeros:
9 and 025 yield 9025
can you state and prove... anything about such numbers?
infinitely many? criteria to form squares? etc!
#iTeachMath ♾️
i write tests intended to verify core understanding w/in 30-50 minutes (projects, presentations, psets are used to extend understanding w/o severe time constraints)
PS&PP test:
docs.google.com/document/d/1...
Precalc midterm:
docs.google.com/document/d/1...
#MathsToday
screenshots in next tweet:
PS&PP test:
docs.google.com/document/d/1...
Precalc midterm:
docs.google.com/document/d/1...
#MathsToday
screenshots in next tweet:
January 24, 2026 at 3:19 PM
i write tests intended to verify core understanding w/in 30-50 minutes (projects, presentations, psets are used to extend understanding w/o severe time constraints)
PS&PP test:
docs.google.com/document/d/1...
Precalc midterm:
docs.google.com/document/d/1...
#MathsToday
screenshots in next tweet:
PS&PP test:
docs.google.com/document/d/1...
Precalc midterm:
docs.google.com/document/d/1...
#MathsToday
screenshots in next tweet:
timely topic! #iTeachMath ♾️
SEASON 5 HAS STARTED!
Check out our latest episode:
Is AI Helpful in Math Education?
Listen and subscribe on Apple Podcasts: podcasts.apple.com/us/podcast/d...
Or listen on Spotify:
open.spotify.com/show/3soGg9I...
Or check us out wherever you listen to podcasts!
#DebateMath
Check out our latest episode:
Is AI Helpful in Math Education?
Listen and subscribe on Apple Podcasts: podcasts.apple.com/us/podcast/d...
Or listen on Spotify:
open.spotify.com/show/3soGg9I...
Or check us out wherever you listen to podcasts!
#DebateMath
January 24, 2026 at 4:50 AM
timely topic! #iTeachMath ♾️
19 years until 01/23/45 i'm ready
January 23, 2026 at 10:09 PM
19 years until 01/23/45 i'm ready
new CollectEdNY blog pot from Mark Trushkowsky!
www.collectedny.org/2026/01/slow...
#iTeachMath ♾️
see posts below ⬇️
www.collectedny.org/2026/01/slow...
#iTeachMath ♾️
see posts below ⬇️
January 23, 2026 at 8:35 PM
new CollectEdNY blog pot from Mark Trushkowsky!
www.collectedny.org/2026/01/slow...
#iTeachMath ♾️
see posts below ⬇️
www.collectedny.org/2026/01/slow...
#iTeachMath ♾️
see posts below ⬇️
blessing the timeline:
January 22, 2026 at 4:26 AM
blessing the timeline:
OTD [19 Jan 2018]: I learned about the 31 page PDF, for Black History Month, to be released as a part of the Feb issue of Notices of the AMS
Even as instability has reared its head in various ways during these 8 years, the *link* itself is still stable!
➡️ www.ams.org/journals/not...
#iTeachMath ♾️
Even as instability has reared its head in various ways during these 8 years, the *link* itself is still stable!
➡️ www.ams.org/journals/not...
#iTeachMath ♾️
www.ams.org
January 19, 2026 at 7:33 PM
OTD [19 Jan 2018]: I learned about the 31 page PDF, for Black History Month, to be released as a part of the Feb issue of Notices of the AMS
Even as instability has reared its head in various ways during these 8 years, the *link* itself is still stable!
➡️ www.ams.org/journals/not...
#iTeachMath ♾️
Even as instability has reared its head in various ways during these 8 years, the *link* itself is still stable!
➡️ www.ams.org/journals/not...
#iTeachMath ♾️
L: = Löschian numbers are those of the form:
a² + ab + b²
Prove or disprove:
a) L is closed under multiplication.
b) the lcm of a finite subset of L is also in L
c) the gcd of a finite subset of L is also in L
Then:
d) State another conjecture or theorem or lie to prove or disprove!
#iTeachMath ♾️
a² + ab + b²
Prove or disprove:
a) L is closed under multiplication.
b) the lcm of a finite subset of L is also in L
c) the gcd of a finite subset of L is also in L
Then:
d) State another conjecture or theorem or lie to prove or disprove!
#iTeachMath ♾️
January 18, 2026 at 5:09 PM
L: = Löschian numbers are those of the form:
a² + ab + b²
Prove or disprove:
a) L is closed under multiplication.
b) the lcm of a finite subset of L is also in L
c) the gcd of a finite subset of L is also in L
Then:
d) State another conjecture or theorem or lie to prove or disprove!
#iTeachMath ♾️
a² + ab + b²
Prove or disprove:
a) L is closed under multiplication.
b) the lcm of a finite subset of L is also in L
c) the gcd of a finite subset of L is also in L
Then:
d) State another conjecture or theorem or lie to prove or disprove!
#iTeachMath ♾️