Separating pages in a book on Shabbos

Hi,

If pages are joined in a book I am reading on Shabbos, may I separate them?

One may separate pages which had once been apart before becoming stuck together, if three conditions are fulfilled:
1) The adhesion is not over actual letters; and
2) The owner would not have wanted them stuck together; and
3) Separating the pages would not tear them, or peel away a layer of their thickness.

If the pages were not cut by the publisher, then one may not separate them; this would be seen as an act of mending the book.

(Pri Megadim Eishel Avraham 340:18; Biur Halachah 340 v'chayyav, Yesodei Yeshurun 4:97; Shemirat Shabbat k'Hilchatah 28:1, 28:footnote 5)

Have a great day,
Mordechai