This is an announcement for the paper "Norm equalities for operators" by Vladimir Kadets, Miguel Martin, and Javier Meri. Abstract: A Banach space $X$ has the Daugavet property if the Daugavet equation $\|\Id + T\|= 1 + \|T\|$ holds for every rank-one operator $T:X \longrightarrow X$. We show that the most natural attempts to introduce new properties by considering other norm equalities for operators (like $\|g(T)\|=f(\|T\|)$ for some functions $f$ and $g$) lead in fact to the Daugavet property of the space. On the other hand there are equations (for example $\|\Id + T\|= \|\Id - T\|$) that lead to new, strictly weaker properties of Banach spaces. Archive classification: Functional Analysis Mathematics Subject Classification: 46B20 Remarks: 21 pages The source file(s), KadMarMer.tex: 56515 bytes, is(are) stored in gzipped form as 0604102.gz with size 17kb. The corresponding postcript file has gzipped size 87kb. Submitted from: mmartins@ugr.es The paper may be downloaded from the archive by web browser from URL http://front.math.ucdavis.edu/math.FA/0604102 or http://arXiv.org/abs/math.FA/0604102 or by email in unzipped form by transmitting an empty message with subject line uget 0604102 or in gzipped form by using subject line get 0604102 to: math@arXiv.org.