Contact Info
Combinatorics & Optimization
University of Waterloo
Waterloo, Ontario
Canada N2L 3G1
Phone: 519-888-4567, ext 33038
PDF files require Adobe Acrobat Reader.
Sun | Mon | Tue | Wed | Thu | Fri | Sat |
---|---|---|---|---|---|---|
31
|
2
|
3
|
4
|
6
|
||
|
|
|
|
|
||
7
|
8
|
9
|
10
|
11
|
13
|
|
|
|
|
|
|
|
|
14
|
15
|
16
|
17
|
18
|
20
|
|
|
|
|
|
|
|
|
21
|
23
|
24
|
25
|
27
|
||
|
|
|
|
|
||
28
|
30
|
1
|
2
|
3
|
4
|
|
|
|
|
|
|
|
Title: The results of a search for small association schemes with noncyclotomic eigenvalues
Speaker: Allen Herman Affiliation: University of Regina Zoom: Contact Soffia ArnadottirAbstract:
Title: On complete classes of valuated matroids
Speaker: László Végh Affiliation: London School of Economics Zoom: Please email Emma WatsonAbstract:
Valuated matroids were introduced by Dress and Wenzel in 1992. They are a central object in discrete convex analysis, and play important roles in other areas such as mathematical economics and tropical geometry. Finding a constructive characterization, i.e., showing that all valuated matroids can be derived from a simple class by some basic operations has been a natural question proposed in various contexts.
Title: Shorter Zero-Knowledge Proofs from MPC
Speaker: Greg Zaverucha Affiliation: Microsoft Research Zoom: Please email Emma WatsonAbstract:
In this talk I will review the MPC-in-the-head approach to constructing zero-knowledge proofs, then talk about some recent research results to make the proofs shorter.
In a zero-knowledge proof system, a prover wants to convince a verifier that they know a secret value, without revealing it. A common case involves a one-way function, where the prover wants to convince a verifier that they know a secret input corresponding to a public output.
Title: The (3+1)-free conjecture of chromatic symmetric functions
Speaker: Steph van Willigenburg Affiliation:University of British Columbia
Zoom: Please email Emma WatsonAbstract:
The chromatic symmetric function, dating from 1995, is a generalization of the chromatic polynomial. A famed conjecture on it, called the Stanley-Stembridge (3+1)-free conjecture, has been the focus of much research lately. In this talk we will be introduced to the chromatic symmetric function, the (3+1)-free conjecture, new cases and tools for resolving it, and answer another question of Stanley of whether the (3+1)-free conjecture can be widened. This talk requires no prior knowledge.
Title: Switching Equivalence on the Grassmannian
Speaker: Emily King Affiliation: Colorado State University Zoom: Contact Soffia ArnadottirAbstract:
When constructing configurations of subspaces with desirable properties, one might ask if the configuration is indeed "new.'' It has been known for about 50 years that Gram matrices of equiangular vectors in real Euclidean space correspond to finite simple graphs via the Seidel adjacency matrix, and the collections of such vectors which span the same lines correspond to switching equivalence classes of graphs.
Title: Quantum Distributed Complexity of Graph Diameter and Set Disjointness
Speaker: Ashwin Nayak Affiliation:University of Waterloo
Zoom: Please email Emma WatsonAbstract:
In the Congest model, a network of p processors cooperate to solve some distributed task. Initially, each processor knows only its unique label, the labels of its neighbours, and a polynomial upper bound on p, the size of the network. The processors communicate with their neighbours in rounds. In each round, a processor may perform local (quantum) computation, and send a short message to each of its neighbours. How many rounds of communication are required for some processor to compute the diameter of the network?
Title: Fractional decompositions and Latin square completion
Speaker: Peter Dukes Affiliation: University of Victoria Zoom: Contact Soffia ArnadottirAbstract:
It was shown recently by Delcourt and Postle that any sufficiently large graph $G$ of order $n$ with minimum degree at least $0.827n$ has a fractional triangle decomposition, i.e. an assignment of weights to the triangles in $G$ such that for every edge $e$, the total of all weights of triangles containing $e$ is exactly one.
Combinatorics & Optimization
University of Waterloo
Waterloo, Ontario
Canada N2L 3G1
Phone: 519-888-4567, ext 33038
PDF files require Adobe Acrobat Reader.
The University of Waterloo acknowledges that much of our work takes place on the traditional territory of the Neutral, Anishinaabeg and Haudenosaunee peoples. Our main campus is situated on the Haldimand Tract, the land granted to the Six Nations that includes six miles on each side of the Grand River. Our active work toward reconciliation takes place across our campuses through research, learning, teaching, and community building, and is centralized within our Office of Indigenous Relations.