Barbara Fantechi
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barbarafantechi.bsky.social
Barbara Fantechi
@barbarafantechi.bsky.social
Mathematician, cis woman, bi, het married, parent of adults. Loud in the physical and metaphorical sense.

https://marginalnotesmaths.blogspot.com/
Best wishes to you or to whoever you are visiting!
November 16, 2025 at 9:46 AM
Reposted by Barbara Fantechi
The official obits are rolling in. I hear the NYT mentions nothing about Alice Palestine support ofc. When she won her MacArthur, Alice got death threats from Zionists. They ruined her joy on a HUGE accomplishment. She told me the MacArthur ppl took down her personal statement & when she complained
November 16, 2025 at 5:53 AM
Looks very fine. What number hook?
November 16, 2025 at 2:41 AM
Filled under "things I learned by parallel parking a 7-seater"
November 15, 2025 at 9:38 PM
No idea what your poetry is like (I don’t “get“ poetry in English) but I doubt any other participant looks more fabulous. Every time I see you with the new hair colour… it fits your style so well!
November 15, 2025 at 6:12 PM
I never could make any sense of logic questions, but I know where they hide!

Last Thursday I told the students as a fact (no proof) that every nonzero ring (commutative with 1) has a maximal ideal. I added that anyone wanting more info should search “abstruse goose zornaholic”.
November 15, 2025 at 5:42 PM
I probably can’t just walk around an random Italian town and post what I see without being slapped with adult content.
November 15, 2025 at 5:15 PM
Reposted by Barbara Fantechi
This is about the moderation putting an Escher behind adult content warning because there are stylized human breasts suggested in the drawing
November 15, 2025 at 5:11 PM
There’s never enough time, but I like the idea of at least hinting that there’s more than meets the eye.
November 15, 2025 at 5:14 PM
definition of locally ringed

functions defined on every open subset
one can restrict and glue them

If f,g are functions, then f+g, f-g and fg are also functions
If f is a function on U open
f(p) exists for p\in U
D(f) :={p in U s.t. f(p)≠0} is open in U
1/f is a function on D(f).

(typo fixed)
November 15, 2025 at 5:00 PM
If at some point you find it or rewrite it, do repost it or link it here!
November 15, 2025 at 4:56 PM
Five feet Is a lot! Where do you display it?
November 15, 2025 at 4:48 PM
Some people have a gift for reconstructing 3D shapes from their 2D image, and manipulating them in their minds. I am extremely bad at this (I tested! Severe underperformer).

Plus in general my eyesight isn’t that great.

On the other hand, I can “see“ what others cannot.
November 15, 2025 at 4:46 PM
This year I explained and sketch of proofed that the spectrum is the “natural“ space with the given functions, once you insist you want to work with locally ringed spaces, which I motivated by referring to manifolds. No idea how to teach algebraic geometry to people who don’t know manifolds.
November 15, 2025 at 4:41 PM