BEGIN:VCALENDAR VERSION:2.0 PRODID:-//commalg.org - ECPv6.15.20//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:commalg.org X-ORIGINAL-URL:https://www.commalg.org X-WR-CALDESC:Events for commalg.org REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20190310T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20191103T060000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20200308T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20201101T060000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20210314T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20211107T060000 END:STANDARD END:VTIMEZONE BEGIN:VTIMEZONE TZID:UTC BEGIN:STANDARD TZOFFSETFROM:+0000 TZOFFSETTO:+0000 TZNAME:UTC DTSTART:20190101T000000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/New_York:20200421T080000 DTEND;TZID=America/New_York:20200421T170000 DTSTAMP:20260421T100956 CREATED:20200421T132358Z LAST-MODIFIED:20200421T132358Z UID:9407-1587456000-1587488400@www.commalg.org SUMMARY:Fellowship of the Ring: Stillman\, "Quadratic Gorenstein rings and the Koszul property" DESCRIPTION:This will be a weekly Commutative Algebra webinar\, hosted by MSRI\, that will take place at 1:30pm Pacific time every Thursday. The organizing committee is listed below. Each talk will have two parts: the first part should be accessible to graduate students after a first course in commutative algebra\, and should survey the basic facts and the goals of some area of commutative algebra; the second part will typically cover recent research. \nThe second Seminar in the series: \nDate/Time: Thursday\, April 23\, 1:30-3pm Pacific time \nSpeaker: Mike Stillman\, Cornell University \nTitle: Quadratic Gorenstein rings and the Koszul property \nAbstract: (joint work with Matt Mastroeni and Hal Schenck) \nA graded ring R = S/I is Gorenstein (S = polynomial ring\, I = homogeneous ideal) if the length of its free resolution over S is its codimension in S\, and the top betti number is one. R is called Koszul if the free resolution of k = R/(maximal homogeneous ideal) over R is linear. Any Koszul algebra is defined by quadratic relations\, but the converse is false\, and no one knows a finitely computable criterion. Both types of rings have duality properties\, and occur in many situations in algebraic geometry and commutative algebra\, and in many cases\, a Gorenstein quadratic algebra coming from geometry is often Koszul (e.g. homogeneous coordinate rings of most canonical curves). \nIn 2001\, Conca\, Rossi\, and Valla asked the question: must a (graded) quadratic Gorenstein algebra of regularity 3 be Koszul? \nIn the first 45 minutes\, we will define these notions\, and give examples of quadratic Gorenstein algebras and Koszul algebras. We will give methods for their construction\, e.g. via inverse systems. After a short break\, we will use these techniques to answer negatively the above question\, as well as see how to construct many otherexamples of quadratic Gorenstein algebras which are not Koszul. \nZoom link: https://msri.zoom.us/webinar/register/WN_RZUNkiShRQS4PVtZa8P9jw \nHow to join: The goal of the seminar is to reach as wide as possible a group of students and faculty interested in commutative algebra\, but some protection is necessary to avoid annoying interference on Zoom. Therefore\, to be on the mailing list of the seminar and receive login information for each webinar\, one must be a member\, vetted by one of the organizers. Students and faculty are invited to send an email requesting membership *from a university account* to any one of the organizers. \nOrganizing Committee: \n\nDavid Eisenbud \, chair\nMel Hochster \nCraig Huneke \nSrikanth Iyengar \nClaudia Miller \nIrena Peeva \nSteven Sam \nKarl E Schwede \nBernd Ulrich URL:https://www.commalg.org/event/fellowship-of-the-ring-stillman-quadratic-gorenstein-rings-and-the-koszul-property/ END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20200418 DTEND;VALUE=DATE:20200420 DTSTAMP:20260421T100956 CREATED:20200118T210734Z LAST-MODIFIED:20200217T083100Z UID:9058-1587168000-1587340799@www.commalg.org SUMMARY:CA+\, Ames Iowa DESCRIPTION:The next iteration of CA+ (short for Commutative Algebra Plus) will take place in Ames\, IA on the campus of Iowa State University from Saturday\, April 18\, 2020 to Sunday\, April 19\, 2020. Conference participants are encouraged to visit the webpage:\nhttp://www-users.math.umn.edu/~cberkesc/CA/CA2020.html\nThe registration page will be available soon. There is some travel funding\, especially for grad students\, postdocs\, and early career faculty. The deadline to register is February 15\, 2020.\nConference Organizers: \n\nChristine Berkesch (Minnesota)\nDaniel Erman (Wisconsin)\nJason McCullough (ISU) URL:https://www.commalg.org/event/ca-ames-iowa/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200416T163000 DTEND;TZID=America/New_York:20200416T190000 DTSTAMP:20260421T100956 CREATED:20200415T151225Z LAST-MODIFIED:20200415T151225Z UID:9370-1587054600-1587063600@www.commalg.org SUMMARY:Fellowship of the Ring: Singh\, "Hankel determinantal rings" DESCRIPTION:This will be a weekly Commutative Algebra webinar\, hosted by MSRI\, that will take place at 1:30pm Pacific time every Thursday. The organizing committee is listed below. Each talk will have two parts: the first part should be accessible to graduate students after a first course in commutative algebra\, and should survey the basic facts and the goals of some area of commutative algebra; the second part will typically cover recent research. \nThe second Seminar in the series: \nDate/Time: Thursday\, April 16\, 1:30-3pm Pacific time \nSpeaker: Anurag Singh\, University of Utah \nTitle: Hankel determinantal rings \nAbstract: We will discuss various aspects of rings defined by minors\nof Hankel matrices of indeterminates\, and sketch a proof that these\nhave rational singularities. This is joint work with Aldo Conca\,\nMaral Mostafazadehfard\, and Matteo Varbaro. \nZoom link: https://msri.zoom.us/webinar/register/WN_jV5f3TCyQx-ha85zcZtBLA \nHow to join: The goal of the seminar is to reach as wide as possible a group of students and faculty interested in commutative algebra\, but some protection is necessary to avoid annoying interference on Zoom. Therefore\, to be on the mailing list of the seminar and receive login information for each webinar\, one must be a member\, vetted by one of the organizers. Students and faculty are invited to send an email requesting membership *from a university account* to any one of the organizers. \nOrganizing Committee: \n\nDavid Eisenbud \, chair\nMel Hochster \nCraig Huneke \nSrikanth Iyengar \nClaudia Miller \nIrena Peeva \nSteven Sam \nKarl E Schwede \nBernd Ulrich URL:https://www.commalg.org/event/fellowship-of-the-ring-singh-hankel-determinantal-rings/ END:VEVENT BEGIN:VEVENT DTSTART;TZID=America/New_York:20200409T163000 DTEND;TZID=America/New_York:20200409T180000 DTSTAMP:20260421T100956 CREATED:20200409T134403Z LAST-MODIFIED:20200409T134403Z UID:9352-1586449800-1586455200@www.commalg.org SUMMARY:Fellowship of the Ring: A National Commutative Algebra Seminar DESCRIPTION:This will be a weekly Commutative Algebra webinar\, hosted by MSRI\, that will take place at 1:30pm Pacific time every Thursday. The organizing committee is listed below. Each talk will have two parts: the first part should be accessible to graduate students after a first course in commutative algebra\, and should survey the basic facts and the goals of some area of commutative algebra; the second part will typically cover recent research. \nThe first Seminar in the series: \nDate/Time: Thursday\, April 9\, 1:30-3pm Pacific time \nSpeaker: Linquan Ma\, Purdue University \nTitle: Multiplicities over local rings\, Lech’s conjecture\, and lim Ulrich sequence \nAbstract: We discuss the theory of Hilbert–Samuel multiplicities: their connections with integral closure\, Koszul homology\, and singularities. We then focus on a long standing conjecture of Lech which states that the multiplicities do not drop under faithfully flat extensions of local rings R–>S. We survey the literature of this conjecture and various attempts to attack it. Finally\, we discuss some very recent work that proves Lech’s conjecture when R is standard graded\, using lim Ulrich sequence and weakly lim Ulrich sequence that we introduce. Roughly speaking\, these are sequences of finitely generated modules that are not necessarily Cohen–Macaulay\, but asymptotically behave like Ulrich modules. We show their existence imply Lech’s conjecture\, and we construct weakly lim Ulrich sequence for standard graded rings of positive characteristic. \nHow to join: The goal of the seminar is to reach as wide as possible a group of students and faculty interested in commutative algebra\, but some protection is necessary to avoid annoying interference on Zoom. Therefore\, to be on the mailing list of the seminar and receive login information for each webinar\, one must be a member\, vetted by one of the organizers. Students and faculty are invited to send an email requesting membership *from a university account* to any one of the organizers. \nOrganizing Committee: \n\nDavid Eisenbud \, chair\nMel Hochster \nCraig Huneke \nSrikanth Iyengar \nClaudia Miller \nIrena Peeva \nSteven Sam \nKarl E Schwede \nBernd Ulrich URL:https://www.commalg.org/event/fellowship-of-the-ring-a-national-commutative-algebra-seminar/ END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20200321 DTEND;VALUE=DATE:20200323 DTSTAMP:20260421T100956 CREATED:20200321T133733Z LAST-MODIFIED:20200321T133852Z UID:9305-1584748800-1584921599@www.commalg.org SUMMARY:Zoom Special Session in Commutative Algebra DESCRIPTION:This session was organized by Eloísa Grifo and Sean Sather-Wagstaff to be held at the AMS Charlottesville Sectional Meeting\, from March 13 to March 15th\, 2020. Since the AMS had to cancel the meeting due to CORONAVIRUS concerns\, they decided to hold a virtual session on March 21 and 22\, on zoom. \nYou can see a list of presenters at https://eloisagrifo.github.io/cvillezoom.html. \nTo watch live: \n\nSaturday session (1:00 – 4:50pm EDT)\nSunday session (1:00 – 4:50pm EDT) URL:https://www.commalg.org/event/zoom-special-session-in-commutative-algebra/ END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20200307 DTEND;VALUE=DATE:20200309 DTSTAMP:20260421T100956 CREATED:20200107T195138Z LAST-MODIFIED:20200217T083141Z UID:8632-1583539200-1583711999@www.commalg.org SUMMARY:SLAM 2020\, Tulane DESCRIPTION:The Southwest Local Algebra Meeting (SLAM) will be held at Tulane University\, 7–8 March 2020. More information can be found on their website:\nhttp://www.math.ttu.edu/~lchriste/slam2020.html URL:https://www.commalg.org/event/slam-2020-tulane/ END:VEVENT END:VCALENDAR