BEGIN:VCALENDAR METHOD:REQUEST PRODID:Microsoft Exchange Server 2010 VERSION:2.0 BEGIN:VTIMEZONE TZID:FLE Standard Time BEGIN:STANDARD DTSTART:16010101T040000 TZOFFSETFROM:+0300 TZOFFSETTO:+0200 RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=10 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010101T030000 TZOFFSETFROM:+0200 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT ORGANIZER;CN=Takanen Emilia:mailto:emilia.takanen@aalto.fi ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=FALSE;CN=agc-math- aalto@list.aalto.fi:mailto:agc-math-aalto@list.aalto.fi ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=FALSE;CN=matlait-h enkilosto@helsinki.fi:mailto:matlait-henkilosto@helsinki.fi DESCRIPTION;LANGUAGE=en-US:We would like to invite you to a talk in the Aal to AGC (Algebra\, Geometry and Combinatorics) Seminar.\n\nThe talk is on\n Tue 23.6. at 14:15-15:00\nin\nM3 (M234)\, Otakaari 1.\n\nThe speaker is\nG erald Williams (University of Essex)\ngiving the talk\nCyclic presentation s of groups\, knot groups\, LOG groups\, and 3-dimensional manifolds\nAbst ract: A cyclic presentation of a group is a group presentation with an equ al number of generators and defining relations that admits a cyclic symmet ry\; the group it defines is called a cyclically presented group. Prominen t examples include Fibonacci groups and Sieradski groups. Many 3-dimension al manifolds\, such as the Brieskorn manifolds have cyclically presented f undamental group.\nLabelled Oriented Graph (LOG) groups are a wide class o f groups that contains all knot and link groups\, high dimensional knot gr oups\, and Artin's braid groups. They are defined in terms of a Wirtinger- like presentation formed from the LOG.\nThe abelianisation (the largest co mmutative quotient) of a cyclically presented group is determined by the S mith Normal form of a circulant matrix associated to the presentation. In an ongoing programme of research with Noferini we develop tools for calcul ating these Smith forms. In this talk I will discuss some of these results and how they can be used to classify cyclically presented groups that are LOG groups and to calculate the homology of the 3-dimensional Brieskorn m anifolds.\nThe webpage of the seminar is at\nmath.aalto.fi/en/research/dis crete/seminars/agc/\nand we have a mailing list at\nhttps://list.aalto.fi/mailman/listinfo /agc-math-aalto\n\n UID:040000008200E00074C5B7101A82E008000000002496F90DA8FFDC01000000000000000 010000000F75A825BD5EB09469D0D9A56A9A0B6B8 SUMMARY;LANGUAGE=en-US:[Aalto AGC Seminar] Gerald Williams (University of E ssex) | Cyclic presentations of groups\, knot groups\, LOG groups\, and 3- dimensional manifolds | Mon 23.6. at 14:15 DTSTART;TZID=FLE Standard Time:20260623T141500 DTEND;TZID=FLE Standard Time:20260623T150000 CLASS:PUBLIC PRIORITY:5 DTSTAMP:20260619T045657Z TRANSP:OPAQUE STATUS:CONFIRMED SEQUENCE:1 LOCATION;LANGUAGE=en-US:M3\, Otakaari 1 X-MICROSOFT-CDO-APPT-SEQUENCE:1 X-MICROSOFT-CDO-OWNERAPPTID:2124847230 X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY X-MICROSOFT-CDO-ALLDAYEVENT:FALSE X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-INSTTYPE:0 X-MICROSOFT-DONOTFORWARDMEETING:FALSE X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MICROSOFT-REQUESTEDATTENDANCEMODE:DEFAULT X-MICROSOFT-ISRESPONSEREQUESTED:FALSE X-MICROSOFT-LOCATIONDISPLAYNAME:M3\, Otakaari 1 X-MICROSOFT-LOCATIONSOURCE:None X-MICROSOFT-LOCATIONS:[{"DisplayName":"M3\, Otakaari 1"\,"LocationAnnotatio n":""\,"LocationUri":""\,"LocationStreet":""\,"LocationCity":""\,"Location State":""\,"LocationCountry":""\,"LocationPostalCode":""\,"LocationFullAdd ress":""}] BEGIN:VALARM DESCRIPTION:REMINDER TRIGGER;RELATED=START:-PT15M ACTION:DISPLAY END:VALARM END:VEVENT END:VCALENDAR