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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable From: Noson@sci.brooklyn.cuny.edu Sent: Wednesday, January 24, 2024 8:48 AM To: N.Y.C. Category Theory Seminar List Subject: Our Spring 2024 Lineup of speakers. The New York City Category Theory Seminar Department of Computer Science Department of Mathematics The Graduate Center of The City University of New York THIS SEMESTER, SOME TALKS WILL BE IN-PERSON AND SOME WILL BE ON ZOOM. Time: Wednesdays 07:00 PM Eastern Time (US and Canada) IN-PERSON INFORMATION: 365 Fifth Avenue (at 34th Street) map (Diagonally across from the Empire State Building) New York, NY 10016-4309 Room 6417 The videos of the lectures will be put up on YouTube a few hours after the = lecture. Seminar web page. Videoed talks. Previous semesters. researchseminars.org page. Contact N. Yanofsky to schedule a speak= er or to add a name to the seminar mailing list. ________________________________ ________________________________ Spring 2024 ________________________________ ________________________________ =95 Speaker: Saeed Salehi, Univeristy of Tarbiz. =95 Date and Time: Wednesday February 7, 2024, 11:00AM - 12:00 NOON. N= OTICE SPECIAL TIME!!! ZOOM TALK!!! =95 Title: On Chaitin's two HP's: (1) Heuristic Principle and (2) Halt= ing Probability. =95 Abstract: Two important achievements of Chaitin will be investigated: = the Omega number, which is claimed to be the halting probability of input-f= ree programs, and the heuristic principle, which is claimed to hold for pro= gram-size complexity. Chaitin's heuristic principle says that the theories = cannot prove the heavier sentences; the sentences and the theories were sup= posedly weighed by various computational complexities, which all turned out= to be wrong or incomplete. In this talk, we will introduce a weighting tha= t is not based on any computational complexity but on the provability power= of the theories, for which Chaitin's heuristic principle holds true. Also,= we will show that the Omega number is not equal to the halting probability= of the input-free programs and will suggest some methods for calculating t= his probability, if any. ________________________________ =95 Speaker: Astra Kolomatskaia, Stony Brook. =95 Date and Time: Wednesday February 28, 2024, 7:00 - 8:30 PM. IN PER= SON TALK! =95 Title: TBA. =95 Abstract: ________________________________ =95 Speaker: Jean-Pierre Marquis, Universite de Montreal. =95 Date and Time: Wednesday March 6, 2024, 7:00 - 8:30 PM. IN PERSON = TALK! =95 Title: Hom sweet Hom: a sketch of the history of duality in catego= ry theory. =95 Abstract: Duality, in its various forms and roles, played a surprising= ly important part in the development of category theory. In this talk, I wi= ll concentrate on the development of these forms and roles that lead to the= categorical formulation of Stone-type dualities in the 1970s. I will empha= size the epistemological gain and loss along the way. ________________________________ =95 Speaker: Sina Hazratpour, Johns Hopkins University. =95 Date and Time: Wednesday March 20, 2024, 7:00 - 8:30 PM. =95 Title: Fibred Categories in Lean. =95 Abstract: ________________________________ =95 Speaker: Emilio Minichiello , The CUNY Graduate Center. =95 Date and Time: Wednesday May 22, 2024, 7:00 - 8:30 PM. IN PERSON T= ALK! =95 Title: TBA. =95 Abstract: ________________________________ You're receiving this message because you're a member of the Categories mai= ling list group from Macquarie University. To take part in this conversatio= n, reply all to this message. View group files | Leave group | = Learn more about Microsoft 365 Groups ------=_NextPart_000_0374_01DA4EB6.C1925CA0 Content-Type: text/html; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable

 

 

From: Noson@sci.brooklyn.cuny.edu <Noson= @sci.brooklyn.cuny.edu>
Sent: Wednesday, January 24, 2024 8:48 AM
To: N.Y.C. Category Theory Seminar List <yanofsky@sci.brooklyn.cu= ny.edu>
Subject: Our Spring 2024 Lineup of speakers.

 

The New York City<= o:p>

Category Theory Seminar

Departmen= t of Computer Science
Department of Mathematics
The Graduate Center of The City University of New York

THIS SEM= ESTER, SOME TALKS WILL BE IN-PERSON AND SOME WILL BE ON ZOOM.
Time: We= dnesdays 07:00 PM Eastern Time (US and Canada)

IN-PERSO= N INFORMATION:
365 Fift= h Avenue (at 34th Street) map
(Diagona= lly across from the Empire State Building)
New York= , NY 10016-4309
Room 641= 7
The vide= os of the lectures will be put up on YouTube a few hours after the lecture.


Seminar web page.
Videoed talks.
Previous semesters.
researchseminars.org page.

Contact = N. Yanofsky to schedule a speaker
or to ad= d a name to the seminar mailing list.

Spring 2024



=B7  = Speaker:     Saeed Salehi, Univeristy of Tarbiz.

=B7  = Date and Time:     Wednesday February 7, 2024= , 11:00AM - 12:00 NOON. NOTICE SPECIAL TIME!!! ZOOM TALK!!!

=B7  = Title:     On Chaitin's two= HP's: (1) Heuristic Principle and (2) Halting Probability.

=B7  Abstract: Two important achievements of Chai= tin will be investigated: the Omega number, which is claimed to be the halt= ing probability of input-free programs, and the heuristic principle, which is claimed to hold for program-size complexity.= Chaitin's heuristic principle says that the theories cannot prove the heav= ier sentences; the sentences and the theories were supposedly weighed by va= rious computational complexities, which all turned out to be wrong or incomplete. In this talk, we will intr= oduce a weighting that is not based on any computational complexity but on = the provability power of the theories, for which Chaitin's heuristic princi= ple holds true. Also, we will show that the Omega number is not equal to the halting probability of the input= -free programs and will suggest some methods for calculating this probabili= ty, if any.

 

=B7  = Speaker:     Astra Kolomats= kaia, Stony Brook.

=B7  = Date and Time:     Wednesday February 28, 202= 4, 7:00 - 8:30 PM. IN PERSON TALK!

=B7  = Title:     TBA.

=B7  Abstract:

 

=B7  = Speaker:     Jean-Pierre Ma= rquis, Universite de Montreal.

=B7  = Date and Time:     Wednesday March 6, 2024, 7= :00 - 8:30 PM. IN PERSON TALK!

=B7  = Title:     Hom sweet Hom: a= sketch of the history of duality in category theory.

=B7  Abstract: Duality, in its various forms and = roles, played a surprisingly important part in the development of category = theory. In this talk, I will concentrate on the development of these forms and roles that lead to the categorical formulat= ion of Stone-type dualities in the 1970s. I will emphasize the epistemologi= cal gain and loss along the way.

 

=B7  = Speaker:     Sina Hazratpou= r, Johns Hopkins University.

=B7  = Date and Time:     Wednesday March 20, 2024, = 7:00 - 8:30 PM.

=B7  = Title:     Fibred Categorie= s in Lean.

=B7  Abstract:

 

=B7  = Speaker:     Emilio Minichi= ello , The CUNY Graduate Center.

=B7  = Date and Time:     Wednesday May 22, 2024, 7:= 00 - 8:30 PM. IN PERSON TALK!

=B7  = Title:     TBA.

=B7  Abstract:

 
 
You're receiving this message because you're a member of the Categories mai= ling list group from Macquarie University. To take part in this conversatio= n, reply all to this message.
 
View group files   |   Leav= e group   |&n= bsp;  Learn more about Microsoft 365 Groups
 
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