Institution: | (1) Cinvestav, Mexico City, Mexico;(2) James J. Kaput Center for Research and Innovation in Mathematics Education, University of Massachusetts Dartmouth, 200 Mill Road, Suite 150B, Fairhaven, MA 02719, USA;(3) Department of Mathematics, University of Massachusetts Dartmouth, 285 Old Westport Rd., Dartmouth, MA 02747, USA |