Angel Garrido
UNED, Madrid
Spain
Ángel Garrido
Department of Fundamental Mathematics,
Faculty of Sciences, UNED,
Paseo Senda del Rey, 9, 28040-Madrid, Spain
E-mail: agarrido@mat.uned.es
Piedad Yuste
UNED, Madrid
Spain
Piedad Yuste
Department and Faculty of Philosophy, UNED,
Paseo Senda del Rey, 7, 28040-Madrid, Spain
E-mail: pyuste@fsof.uned.es