 He discovered also a new demonstration of the Pythagorean theorem, which was praised by Cauchy, the well-known French mathematician.A year later (1803) Reggio went to Trieste, where for three years he was a tutor in the house of a wealthy family.There he made a friend of Mordecai Isaac de Cologna, at whose death (1824) Reggio wrote a funeral oration in Italian.