We prove that if a paratopological group G is a continuous image of an arbitrary product of regular Lindelöf Σ-spaces, then it is R-factorizable and has countable cellularity. If in addition, G is regular, then it is totally ω-narrow and satisfies celω(G) ≤ ω, and the Hewitt–Nachbin completion of G is again an R-factorizable paratopological group.

Enrolment and success rates are very crucial for any educational system in the world but they are more important for the developing countries like Bangladesh. Gender differences in enrolment and success rates are also emerging issues. This study investigated the enrolment and success rate’s status in secondary educational system of Bangladesh along with internal efficiency rates involving compl...

When an observer is faced with an ambiguous, occluded or degraded image, the image will frequently be perceptually completed. In perceptual completion observers report seeing the presence of features or objects which are actually absent that are the complement or “completion” of features or objects in the image. We report a novel completion effect resulting from adding half of a bilaterally sym...