Hi, Does anyone know where I can find informations on how to write equations using the Equa tool?In particular, i am looking for informations on how to use logical operators such as AND and OR. Thanks in advance, giacomo -- Giacomo Villi Univerisità degli Studi di Padova Dipartimento di Fisica Tecnica (DFT) via Venezia, 1 Tel: +39 049 8276871