S-Quasi-symmetry

Quasi-projective covers of right $S$-acts

In this paper $S$ is a monoid with a left zero and $A_S$ (or $A$) is a unitary right $S$-act. It is shown that a monoid $S$ is right perfect (semiperfect) if and only if every (finitely generated) strongly flat right $S$-act is quasi-projective. Also it is shown that if every right $S$-act has a unique zero element, then the existence of a quasi-projective cover for each right act implies that ...

Quasi-local charges and asymptotic symmetry generators

The quasi-local formulation of conserved charges through the off-shell approach is extended to cover the asymptotic symmetry generators. By introducing identically conserved currents which are appropriate for asymptotic Killing vectors, we show that the asymptotic symmetry generators can be understood as quasi-local charges. We also show that this construction is completely consistent with the ...

Quasi-symmetry and Representation Theory – 541 –

— Quasi-symmetry is a model for square contingency tables with rows and columns indexed by the same set. In a log-linear model, quasi-symmetry is associated with a vector subspace QSn of certain realvalued functions on n × n. Permutation of factor levels induces a linear transformation QSn → QSn, making this into a representation of the symmetric group Sn. However, there are many group represen...

Attribute Estimation and Testing Quasi-Symmetry

A Boolean function is symmetric if it is invariant under all permutations of its arguments; it is quasi-symmetric if it is symmetric with respect to the arguments on which it actually depends. We present a test that accepts every quasi-symmetric function and, except with an error probability at most δ > 0, rejects every function that differs from every quasi-symmetric function on at least a fra...

Quasi-symmetry of Conjugacies between Interval Maps