Preface to the special issue dedicated to James Montaldi
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1.
Departamento de Matemáticas y Mecánica, IIMAS-UNAM, Apdo. Postal 20-126, Col. San Ángel, Mexico City, 01000, Mexico
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2.
Instituto de Ciencias Matemáticas, CSIC, c/ Nicolás Cabrera 13-15, 28049 Madrid, Spain
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3.
Faculty of Mathematics and Statistics, University of St Gallen, Bodanstrasse 6, CH-9000 St. Gallen, Switzerland and Centre National de la Recherche Scientifique (CNRS), France