A simple proof of Xia's proposition
This paper studies a spectral property of a k-tuple of hyponormal operators T = (T1, ..., Tn) with compact self commutators. Mathematics Subject Classification: 47B20 This research is partially supported by Grant-in-Aid Research No. 17540176. This research is partially supported by Grant-in-Aid Research No. 17740086. 2080 M. Chō, T. Huruya and M. Seto