BEGIN:VCALENDAR
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PRODID:UWA Whatson
X-WR-CALNAME;VALUE=TEXT:What's On At UWA
X-WR-TIMEZONE;VALUE=TEXT:Australia/Perth
METHOD:PUBLISH
BEGIN:VTIMEZONE
TZID:/softwarestudio.org/Olson_20010626_2/Australia/Perth
X-LIC-LOCATION:Australia/Perth
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TZOFFSETFROM:+0800
TZOFFSETTO:+0800
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DTSTART:19700101T000000
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BEGIN:VEVENT
UID:P-20171009T031549Z-3080-4353@events.uwa.edu.au
DTSTART;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171015T160000
DTEND;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171015T170000
CLASS:PUBLIC
CREATED:20171009T031549Z
DESCRIPTION:There will be refreshments in Maths & Stats tea room at 15:40\
, and we will\ngo for drinks at the UWA Tavern or the UniClub after the se
minar. All are most welcome.\n\nSpeaker: John Bamberg (University of Weste
rn Australia)\nTitle: q-analogues of designs and the 2-Fano plane\nTime an
d place: 16:00 Friday 13/10/2017 in Weatherburn LT\n\nAbstract: A q-analog
ue of a t-design\, called a t-(n\,k\, ambda)_q design\, is a set of k-subs
paces of F_q^n such that each t-subspace is contained in exactly ambda el
ements. If t = 1\, the design is a q-analogue of a Steiner system\, and is
denoted S_q(t\,k\,n). Braun\, Østergård\, Vardy and Wassermann have sho
wn that q-Steiner systems do exist\, but existence is not known in the cas
e of S_q[2\; 3\; 7]\, the q-analogue of a Fano plane. Kiermeir\, Kurz and
Wassermann have shown that if a S_2[2\; 3\; 7] exists\, then the order of
its automorphism group would be at most 2. We will present the progress of
our search for S_2[2\; 3\; 7] (or its non-existence)\, in particular\, we
have found that no 2-Fano plane exists with automorphism group of order 2
. This is join work with Ferdinand Ihringer\, Jesse Lansdown\, and Gordon
Royle.\n\nPast and future seminars may be found at http://www.maths.uwa.ed
u.au/~glasby/S17.html
DTSTAMP:20171009T031549Z
LAST-MODIFIED:20171009T163034Z
ORGANIZER;CN=Stephen Glasby:MAILTO:glasbys@gmail.com
SEQUENCE:2
SUMMARY:Groups and Combinatorics Seminar 16:00 Fri 15/10/2017 Weatherburn
LT: John Bamberg
URL:http://events.uwa.edu.au/event/20171009T031549Z-3080-4353@events.uwa.e
du.au/whatson/CMSC
END:VEVENT
BEGIN:VEVENT
UID:P-20171023T125018Z-3080-10065@events.uwa.edu.au
DTSTART;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171027T160000
DTEND;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171027T170000
CLASS:PUBLIC
CREATED:20171023T125018Z
DESCRIPTION:There will be `cake' in the Mathematics and Statistics tea roo
m at 15:40. The seminar starts at 16:00\, and after 17:05 we go to the Uni
Club or Student Tavern for a drink.\nNote the unusual location.\n\nSpeaker
: Hongxue Liang (University of Western Australia)\n\nTitle: Flag-transitiv
e point-primitive non-symmetric 2-(v\,k\,2) designs\n\nTime and place: 16:
00 Friday 27/10/2017 in Woolnough Lecture Theatre 2 GGGL:107\n\nAbstract:
A 2-(v\,k\,λ\;) design is a finite incidence structure D=(P\, B) consi
sting of v points and b blocks such that every block is incident with k po
ints\, every point is incident with r blocks\, and any two distinct points
are incident with exactly λ\; blocks. D is called symmetric if v=b (o
r equivalently r=k)\, and non-trivial if 1< k< v. A flag of D is an incide
nt point-block pair (α\;\, B) where α\; is a point and B is a bloc
k. An automorphism of D is a permutation of the points which also permutes
the blocks. The set of all automorphisms of D with the composition of map
s is a group\, denoted by Aut(D). A subgroup G≤\;Aut( D) is called po
int-primitive if it acts primitively on P and flag-transitive if it acts t
ransitively on the set of flags of D. In this talk\, we will focus on the
flag-transitive point-primitive automorphism groups of non-symmetric 2-(v\
,k\,2) designs.\n\nPast and future seminars may be found at http://www.mat
hs.uwa.edu.au/~glasby/S17.html\n
DTSTAMP:20171023T125018Z
LAST-MODIFIED:20171024T033009Z
ORGANIZER;CN=Stephen Glasby:MAILTO:glasbys@gmail.com
SEQUENCE:2
SUMMARY:Groups and Combinatorics Seminar 16:00 Fri 27/10/2017: Hongxue Lia
ng
URL:http://events.uwa.edu.au/event/20171023T125018Z-3080-10065@events.uwa.
edu.au/whatson/CMSC
END:VEVENT
BEGIN:VEVENT
UID:P-20171030T023613Z-3080-9985@events.uwa.edu.au
DTSTART;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171103T160000
DTEND;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171103T170000
CLASS:PUBLIC
CREATED:20171030T023613Z
DESCRIPTION:Speaker: Yian Xu (University of Western Australia)\nTitle: Con
structing a 2-arc-transitive cover for a certain hypercube\nTime and place
: 16:00 Friday 03/11/2017 in Weatherburn LT\n\nAbstract: The canonical bas
is\, which is a particular type of basis of a vector space will be introdu
ced in this talk\, and a sufficient and necessary condition is given to de
termine the existence of such a basis for a vector space. The structures o
f canonical bases are then used to study Cayley graphs of extraspecial $2$
-groups of order $2^{2r+1}$ ($r eq 1$)\, which are further shown to be nor
mal Cayley graphs and $2$-arc-transitive covers of $2r$-dimensional hyperc
ubes. \;
DTSTAMP:20171030T023613Z
LAST-MODIFIED:20171031T090451Z
ORGANIZER;CN=Stephen Glasby:MAILTO:glasbys@gmail.com
SEQUENCE:2
SUMMARY:Groups and Combinatorics Seminar 16:00 Fri 03/11/2017 Weatherburn
LT: Yian Xu
URL:http://events.uwa.edu.au/event/20171030T023613Z-3080-9985@events.uwa.e
du.au/whatson/CMSC
END:VEVENT
BEGIN:VEVENT
UID:P-20171106T024709Z-3080-13964@events.uwa.edu.au
DTSTART;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171110T160000
DTEND;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171110T170000
CLASS:PUBLIC
CREATED:20171106T024709Z
DESCRIPTION:Speaker: Alexander Bors (University of Western Australia and U
niversity of Salzburg)\n\nTitle: Worst-case approximability of functions o
n finite groups by endomorphisms and affine maps\n\nTime and place: 16:00
Friday 10/11/2017 in Weatherburn LT\n\nAbstract: http://www.maths.uwa.edu.
au/~glasby/S17.html
DTSTAMP:20171106T024709Z
LAST-MODIFIED:20171106T114515Z
ORGANIZER;CN=Stephen Glasby:MAILTO:glasbys@gmail.com
SEQUENCE:3
SUMMARY:Groups and Combinatorics Seminar 16:00 Fri 10/11/2017 Weatherburn
LT: Alexander Bors (UWA and U. Salsburg)
URL:http://events.uwa.edu.au/event/20171106T024709Z-3080-13964@events.uwa.
edu.au/whatson/CMSC
END:VEVENT
BEGIN:VEVENT
UID:P-20171113T031518Z-3080-16469@events.uwa.edu.au
DTSTART;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171117T160000
DTEND;TZID=/softwarestudio.org/Olson_20010626_2/Australia/Perth:20171117T170000
CLASS:PUBLIC
CREATED:20171113T031518Z
DESCRIPTION:There will be refreshments in Maths & Stats tea room at 15:40\
, and we will\ngo for drinks at the UWA Tavern or the UniClub after the se
minar. All are most welcome.\n\nSpeaker: Stephen Glasby (University of Wes
tern Australia)\n\nTitle: Norman involutions and tensor products of unipot
ent Jordan blocks\n\nTime and place: 16:00 Friday 17/11/2017 in Weatherbur
n LT\n\nAbstract: Suppose R is an rxr unipotent matrix over some field F\,
i.e. its characteristic polynomial is (t-1)^r. The Jordan form of R is a
sum of unipotent Jordan blocks\, so we obtain some partition of r. If S is
a unipotent sxs matrix over F\, then so is R times S. To understand the p
artition of rs afforded by R times S it suffices to understand the partiti
on afforded by J_r times J_s where J_r denotes a single rxr unipotent Jord
an block. When char(F)=p\, we denote this partition by lambda(r\,s\,p).\n\
nWhen p>0\, the partitions lambda(r\,s\,p) are shrouded in mystery. Assume
r<= s. We show that there is a larger set of 2^{r-1}-1 partitions (which
is independent of p) and contains the mysterious partitions. These partiti
ons correspond to involutions in the symmetric group S_r of degree r\, and
also to nonempty subsets of the set {1\,2\,...\,r-1}. We also show that t
he group G(r\,p)== r>\, is a wreath product\, and we
determine its structure.\n\nOne motivation for this research comes from re
presentation theory: understanding the structure of the Green ring. This i
s joint work with Cheryl E. Praeger and Binzhou Xia.
DTSTAMP:20171113T031518Z
LAST-MODIFIED:20171113T121313Z
ORGANIZER;CN=Stephen Glasby:MAILTO:glasbys@gmail.com
SEQUENCE:4
SUMMARY:Groups and Combinatorics Seminar 16:00 Fri 17/11/2017 Weatherburn
LT: Stephen Glasby (UWA)
URL:http://events.uwa.edu.au/event/20171113T031518Z-3080-16469@events.uwa.
edu.au/whatson/CMSC
END:VEVENT
END:VCALENDAR