on a busy day - one of my math chalkboards

 

Belief Revision (AGM Basics)

 

Steven Strogatz - Two dimensional linear systems

Nonlinear Dynamics and Chaos - Steven Strogatz, Cornell University (MAE 5790 - Introduction to nonlinear dynamics)

Arithmetic dynamics (Joseph Silverman)

 

Rush - Tom Sawyer

 

A short classroom exercise on partially ordered sets

 

Clasa XII C 1982 Liceul Mihai Viteazul Ploiesti

 

Meta AI on language similarities between Calin Georgescu and Nicolae Ceausescu

"Calin Georgescu's language is indeed similar to Nicolae Ceausescu's in some respects. Both leaders have adopted a perspective of Romanian exceptionalism, conveyed through a language of nationalist mysticism. This means they often employed a rhetoric that emphasized Romania's unique cultural and historical significance. However, it's worth noting that Ceausescu's discourse was rooted in communist ideology, whereas Georgescu's language seems to be more aligned with nationalist and fascist tendencies, drawing parallels with figures like Corneliu Zelea Codreanu."

More context: Anne Applebaum - "The New Rasputins" The Atlantic Column, January 7 2025

Moving on - ginduri de An Nou

De Anul Nou gindurile ma duc la un coleg (former Department Chair) genial, care are urmatorul talent: in momente dificile sau dezbateri care (d)evolueaza in tensiune si/sau confuzie, reuseste sa sparga gheata si sa aduca o reinnoita stare de concentratie si calm la masa discutiilor printr-o simpla fraza:

Moving on!

O fraza scurta cu efecte surprinzator de puternice.

De Anul Nou doresc Romaniei rinnoirea drumului sau european, Cit mai departe de haosul "suveranist" suportat si incurajat de ne-prietenii Romaniei.

Un acelasi "Moving on!" pentru noi toti.

Catre Europa inseamna catre noi.

Pseudorandomness of the Mobius function - Peter Sarnak

 

Memories - a beautiful campus and an abstract - 27 years ago

I vividly remember that talk. 

People were great! Added bonus: the campus and the nature were amazing. 

I could recover my abstract from https://scholarworks.umt.edu/mathcolloquia/7/

 

So... about 27 years years ago:

 

Presentation Date 10-23-1997 

Abstract A classical problem considered by Davenport asks for the number of occurrences of a certain pattern of quadratic residues and nonresidues among the set of integers modulo a prime p. We will take this problem as a starting point of an itinerary revealing the interplay between quasirandom structures over finite fields, definable subsets of finite fields, character sums and coding theory. 

Additional Details Thursday, October 23, 1997 4:10 p.m. in MA 109 Coffee/Tea/Treats 3:30 p.m. in MA 104 (Lounge)

The eternal paradox of neuroscience

"If the human brain were so simple that we could understand it, we would be so simple that we couldn't."

Emerson Pugh

Pictured: Cross-section of a human head, showing location of the hypothalamus (source)