TY - JOUR AU - Rodríguez Sanjurjo, José Manuel PY - 1989 SN - 0009-725X UR - https://hdl.handle.net/20.500.14352/58579 T2 - Rendiconti del Circolo Matematico di Palermo AB - In ANR theory, the following result is well known: Suppose that X ′ is an ANR and X is a subspace of X ′ . Then X is a strong (or stationary) deformation retract of X ′ if and only if X is a deformation retract of X ′ . In this paper, a... LA - eng M2 - 291 PB - Springer KW - MANR-spaces KW - W-shape deformation retract KW - Fox shape theory KW - regular mutational retraction KW - deformation mutational retraction TI - On mutational deformation retracts TY - journal article VL - 21 ER -