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- Saitama UniversityJP4 papers
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5 papers · 1 filter
Intrinsically knotted graphs with linklessly embeddable simple minors
Thomas W. Mattman, Ramin Naimi, Andrei Pavelescu +1
It has been an open question whether the deletion or contraction of an edge in an intrinsically knotted graph always yields an intrinsically linked graph. We present a new intrinsi…
On lattice isomorphisms of orthodox semigroups
Simon M. Goberstein
Two semigroups are lattice isomorphic if the lattices of their subsemigroups are isomorphic, and a class of semigroups is lattice closed if it contains every semigroup which is lat…
Perfect congruences on bisimple -semigroups
Simon M. Goberstein, Katherine Grimshaw, Anthony Kling +2
A congruence on a semigroup is perfect if for any congruence classes and their product as subsets of coincides (as a set) with t…
Investigating society's educational debts due to racism and sexism in student attitudes about physics using quantitative critical race theory
Jayson Nissen, Ian Her Many Horses, Ben Van Dusen
The American Physical Society calls on its members to improve the diversity of physics by supporting an inclusive culture that encourages women and Black, Indigenous, and people of…
Maximal knotless graphs
Lindsay Eakins, Thomas Fleming, Thomas W. Mattman
A graph is maximal knotless if it is edge maximal for the property of knotless embedding in . We show that such a graph has at least edges, and construct an infi…