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- Combinatorics Seminar — Department of Mathematics and Computer Science

with Washington University Past Combinatorics Graph Theory Seminars Upcoming Seminars There are currently no items in this folder Document Actions RSS feed Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name January 2016 January Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Original URL path: http://mathcs.slu.edu/seminars/combinatorics-seminar/graph-theory-seminar/?month:int=1&year:int=2016&orig_query= (2016-02-12)

Open archived version from archive - Past Seminars — Department of Mathematics and Computer Science

11 00 AM Topology Seminar Open to the public a learning seminar with talks from advanced graduate students Exotic Spheres 03 Jan 28 2016 11 00 AM Topology Seminar Open to the public a learning seminar with talks from advanced graduate students Exotic Spheres 02 Jan 21 2016 11 00 AM Topology Seminar Open to the public a learning seminar with talks from advanced graduate students Exotic Spheres 01 Dec 04 2015 04 10 PM Graduate Seminar Vignon Oussa Bridgewater State University PhD ε Dec 01 2015 02 10 PM Geometry Topology Seminar Topology Seminar James Hebda SLU Replacing the Lower Curvature Bound in Toponogov s Comparison Theorem by a Weaker Condition Nov 23 2015 11 00 AM PhD Oral Exam Geometry Topology Seminar Topology Seminar Gerrit Smith SLU Generalizing the Kneser Conjecture Nov 19 2015 12 00 PM Analysis Seminar Daniel Freeman SLU Weaving frames and bases for Banach spaces Nov 17 2015 11 00 AM PhD Oral Exam Geometry Topology Seminar Topology Seminar Sean Corrigan SLU Orbifold Morse Functions and Associated Handle Decompositions Nov 10 2015 02 10 PM Geometry Topology Seminar Topology Seminar Kimberly Druschel SLU Finite Subgroups of SO 4 Nov 03 2015 02 10 PM Geometry Topology Seminar Topology Seminar Stacey Harris SLU Complete Connection on the Causal Boundary of Spherically Symmetric Static Spacetimes II Oct 27 2015 02 10 PM Geometry Topology Seminar Topology Seminar by Dr Stacey Harris of Saint Louis U Complete Connection on the Causal Boundary of Spherically Symmetric Static Spacetimes Oct 13 2015 02 10 PM Geometry Topology Seminar Topology Seminar by Dr Anthony Bedenikovic of Bradley U Asphericity Results for Labeled Oriented Tree Complexes Oct 06 2015 02 10 PM Geometry Topology Seminar Topology Seminar by Dr Carlos Vega of Saint Louis U Null Distance on a Spacetime II

Original URL path: http://mathcs.slu.edu/seminars/past-seminars/ (2016-02-12)

Open archived version from archive - Finite Subgroups of SO(4) — Department of Mathematics and Computer Science

Ritter Hall Contact Name Dr Khan Add event to calendar vCal iCal The finite subgroups of SO 3 are the dihedral groups and the three symmetry groups of Platonic solids the tetrahedron octahedron and icosahedron groups which are in turn the alternating and symmetric groups A 4 S 4 and A 5 The multiplication of quaternions leads nicely to a determination of the finite subgroups of SO 4 the special orthogonal group of dimension four real matrices There are many infinite families of such groups and as for SO 3 some individual groups which relate to symmetries of regular polytopes We will derive this list and look at some of the groups properties and specific examples including symplectic groups and symmetry groups of regular four polytopes and quotients by these groups This is a background talk for talks I ll give early next semester on orbifolds There I ll focus on low dimensional orbifolds particularly those of dimensions four and five vertex group homology in those degrees and orbifold cobordism and invariants This talk is meant to be accessible to all graduate students Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly

Original URL path: http://mathcs.slu.edu/seminars/finite-subgroups-of-so-4 (2016-02-12)

Open archived version from archive - Complete Connection on the Causal Boundary of Spherically Symmetric Static Spacetimes, II — Department of Mathematics and Computer Science

Topology Seminar Stacey Harris SLU What Geometry Topology Seminar Topology Seminar When Tue Nov 03 2015 from 02 10 PM to 03 00 PM Where 225 Ritter Hall Contact Name Dr Khan Add event to calendar vCal iCal A continuation of Part I Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name February

Original URL path: http://mathcs.slu.edu/seminars/topology-seminar/complete-connection-on-the-causal-boundary-of-spherically-symmetric-static-spacetimes-ii (2016-02-12)

Open archived version from archive - Complete Connection on the Causal Boundary of Spherically Symmetric Static Spacetimes — Department of Mathematics and Computer Science

Theoretical cosmology likes to make use of a conformal boundary for various spacetime models this means mapping via diffeomorphism on the image a physical spacetime M into a non physical spacetime M such that the mapping is conformal preserved causality and the image of M has compact closure in M hence M gets endowed with a boundary inheriting geometry from M One of the desireable properties of such a boundary is that it be complete in an appropriate sense A recent observation is that this is always possible for a static spherically symmetric spacetime or at any rate for physically reasonable ones But a conformal boundary is inherently a very ad hoc construction Is there any way to do this naturally The answer is yes The causal boundary construction is entirely natural in a categorical sense and it is well understood for static spherically symmetric spacetimes The problem is that the causal boundary comes with a topology but not a geometry and it is geometry that is needed to answer the question about completeness This talk illustrates a method of imputing a linear connection on the causal boundary of a static spherically symmetric spacetime There is not a unique way

Original URL path: http://mathcs.slu.edu/seminars/complete-connection-on-the-causal-boundary-of-spherically-symmetric-static-spacetimes (2016-02-12)

Open archived version from archive - Asphericity Results for Labeled Oriented Tree Complexes — Department of Mathematics and Computer Science

Topology Seminar When Tue Oct 13 2015 from 02 10 PM to 03 00 PM Where 225 Ritter Hall Contact Name Dr Khan Add event to calendar vCal iCal Labeled oriented tree LOT complexes are 2 dimensional complexes whose structure is encoded in directed trees with vertex labels on their edges These complexes it turns out strongly resemble spines for classical knot complements in the 3 sphere In fact every classical knot complement may be regarded as an LOT complex In light of this connection it is natural to ask whether or not LOT complexes are aspherical that is whether or not their higher homotopy groups vanish In this talk we will explore the connection with classical knot complements and consider partial results relating to asphericity Beyond their role in 3 dimensional matters LOT complexes are known to correspond to the complements of certain kinds of disks in the 4 ball We will use this higher dimensional connection to obtain additional asphericity results The techniques here are visual for just a moment then combinatorial Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name

Original URL path: http://mathcs.slu.edu/seminars/asphericity-results-for-labeled-oriented-tree-complexes (2016-02-12)

Open archived version from archive - Null Distance on a Spacetime, II — Department of Mathematics and Computer Science

Louis U What Geometry Topology Seminar Topology Seminar When Tue Oct 06 2015 from 02 10 PM to 03 00 PM Where 225 Ritter Hall Contact Name Dr Khan Add event to calendar vCal iCal Continuation of first talk Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name February 2016 February Su Mo

Original URL path: http://mathcs.slu.edu/seminars/topology-seminar/null-distance-on-a-spacetime-ii (2016-02-12)

Open archived version from archive - Euclidean Embeddings of Snowflake Metric Spaces — Department of Mathematics and Computer Science

Students Info Euclidean Embeddings of Snowflake Metric Spaces filed under Analysis Seminar by Marie Snipes Kenyon College What Analysis Seminar When Fri Sep 25 2015 from 04 00 PM to 05 00 PM Where Ritter Hall 229 Contact Name James Gill Add event to calendar vCal iCal Metric spaces are useful tools for modeling sets of objects where there is a natural notion of distance examples include geographical data genetic data and signals like sound waves or images We often seek to classify metric spaces by how Euclidean they look specifically we want to know if some metric space can be embedded in Euclidean space In this talk we will use examples to introduce the general embedding problem We will then discuss a theorem by Assouad guaranteeing bi Lipschitz embeddings of so called snowflake metric spaces into Euclidean space and some related work by Naor Nieman and David Snipes Document Actions iCalendar vCalendar Send this Print this Subscribe to Talklist Sign up here for a weekly email of upcoming department events Email address Your name February 2016 February Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Original URL path: http://mathcs.slu.edu/seminars/analysis-seminar/euclidean-embeddings-of-snowflake-metric-spaces (2016-02-12)

Open archived version from archive