Question: Were Ignacy Feliks Dobrzyński and Niels Diffrient of the same nationality?
Sentence (from "Bronisław Dobrzyński"): He is most known for his book on his father's life and work(" Ignacy Dobrzyński w zakresie działalności dążącej do postępu muzyki w współczesnej jemu epoce".
Relevant evidence: No