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ABSTRACT
S. Bulman-Fleming (Citation1992) presented necessary and sufficient conditions under which an amalgam of two copies of a monoid by a proper right ideal is flat, weakly flat, or principally weakly flat. In this note, a similar problem is considered for other generalizations of projective acts, namely for weak, Rees weak, and principal Rees weak projectivity.
ACKNOWLEDGMENTS
Kilp's research is supported by Estonian Science Foundation grant \#4557 and Knauer's research is supported by Deutsche Forschungsgemeinschaft.
Notes
#Communicated by D. Easdown.