Some Contributions on $P_F$-frames
The concept of $P_F$-frames was introduced by Ngoako [24] as a point-free extension of $P_F$-spaces. We observe that the open cozero quotient of a $P_F$-frame is itself a $P_F$-frame. The class of $P_F$-frames contains the class of $P$-frames and is, in turn, contained in the class of $F$-frames. We show that a frame $L$ is a $P_F$-frame if and only if $\beta L$ is a $P_F$-frame. Moreover, $P_F$-frames are precisely those essential $P$-frames that are also $F$-frames. Lastly, we provide a characterization of $P_F$-frames via $z$-, $d$-, and $z_r$-ideals.
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