A property of orthodox semigroups.
A note on smooth fans
Metrizability of trees
A unique factorization theorem for countable products of circles
Elementary orthodox semigroups.
On smooth dendroids
Spaces of order arcs in hyperspaces
Open maps between Knaster continua
We investigate the set of open maps from one Knaster continuum to another. A structure theorem for the semigroup of open induced maps on a Knaster continuum is obtained. Homeomorphisms which are not induced are constructed, and it is shown that the induced open maps are dense in the space of open maps between two Knaster continua. Results about the structure of the semigroup of open maps on a Knaster continuum are obtained and two questions about the structure are posed.
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