Solution manifolds for systems of differential equations.
Spectra of finitely generated Boolean flows.
Eventually cyclic spectra of parameterized flows.
The cyclic spectrum of a Boolean flow.
Local extension of maps.
Isbell duality.
Isbell duality for modules.
Searching for more absolute CR-epic spaces.
On *-autonomous categories of topological modules.
Contractible simplicial objects
We raise the question of when a simplicial object in a catetgory is deemed contractible. The literature offers three definitions. One is the existence of an “extra degeneracy”, indexed by , which does not quite live up to the name. This can be strengthened to a “strong extra degeneracy". Another possibility is that it be homotopic to a constant simplicial object. Despite claims in the literature to the contrary, we show that all three are distinct concepts with strong extra degeneracy implies extra...
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