EHP spectral sequence

The EHP spectral sequence is a tool in homotopy theory and stable homotopy theory, particularly involving the study of the stable homotopy groups of spheres. It is named after the mathematicians Eilenberg, Henriques, and Priddy—hence EHP. The EHP spectral sequence arises from the framework of stable homotopy types and is associated with the "suspension" of spaces and the mapping spaces between them.