K-continuous Functions and Right B1 Compositors

• Main Authors: Fenecios, Jonald P, Cabral, Emmanuel A
• Format: text
• Published: Archīum Ateneo 2012
• Subjects: Baire class one; right B1 compositor; D-continuous; k-continuous; Mathematics
• Online Access: https://archium.ateneo.edu/mathematics-faculty-pubs/58; https://www.neliti.com/publications/93499/k-continuous-functions-and-right-b1-compositors#cite
• Institution: Ateneo De Manila University

A function g:R→R from the real line to itself is called a right B1 compositor if for any Baire class one function f:R→R,f◦g:R→R is Baire class one. In this study, we first apply Jayne-Rogers Theorem [2] to prove that every right B1 compositor is D-continuous where D is the class of all positive functions on R and thus give a positive answer to a problem posed by D. Zhao. This result then characterizes the right B1 compositor as a class of naturally defined functions. Furthermore, we also improved some of the results in [4]. Lastly, a counter example was constructed to a claim in [4] that every function with a finite number of discontinuity points is left B1 compositor.