An e-page is a term used in the context of spectral sequences, particularly the Atiyah-Hirzebruch spectral sequence, to refer to the page at which one computes the $E$-terms, which give crucial information about cohomology. The e-page specifically allows mathematicians to analyze the convergence of the spectral sequence and extract significant topological data from a given space.
congrats on reading the definition of e-page. now let's actually learn it.