He also attacked a young Catholic mathematician Fabrizio Mordente, publishing four dialogues which made fun of Mordente's views. Bruno was forced to leave Paris and he went to Germany where he travelled around the universities lecturing on his beliefs, and attacking the views of mathematicians and philosophers.
Siya din attacked ng isang batang Katoliko dalubbilang Fabrizio Mordente, sa paglalathala sa apat na dialogues na ginawa ng kasiyahan ng Mordente's views. Bruno ay sapilitang umalis sa Paris at nagpunta siya sa Germany kung saan siya manlalakbay sa paligid ng unibersidad lecturing sa kanyang pinaniniwalaan, at atake ang mga opinyon ng mga mathematicians at philosophers.