The P -frame Reflection of a Completely Regular Frame

نویسندگان

  • RICHARD N. BALL
  • JOANNE WALTERS-WAYLAND
  • ERIC ZENK
چکیده

We show that every completely regular frame has a P -frame re‡ection. The proof is straightforward in the case of a Lindelöf frame, but more complicated in the general case. The chief obstacle to a simple proof is the important fact that a quotient of a P -frame need not be a P -frame, and we give an example of this. Our proof of the existence of the P -frame re‡ection in the general case is iterative, freely adding complements at each stage for the cozero elements of the stage before. The argument hinges on the signi…cant fact that frame colimits preserve Lindelöf degree. We also outline the relationship between the P -frame re‡ection of a space X and the topology of the P -space core‡ection of X. Although the former frame is generally much bigger than the latter, it is always the case that the P -space core‡ection of X is the space of points of the P -frame re‡ection of the topology on X.

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تاریخ انتشار 2011