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The multiplicative structure on the graded slices of Hermitian $$K$$-theory and Witt-theory. (English) Zbl 1352.14013
In [Geom. Topol. 20, No. 2, 1157–1212 (2016; Zbl 1416.19001)], the authors computed all slices $$s_q E$$ ($$q \in \mathbb Z$$) for the motivic spectra $$E$$ representing hermitian $$K$$-theory and Witt-theory, respectively. The present short addendum completes these calculations by describing the respective graded slices $$s_* E := \bigoplus_q s_q E$$ as graded ring spectra. As a corollary, the authors provide explicit descriptions of the first differential in the associated slice spectral sequences.

##### MSC:
 14F42 Motivic cohomology; motivic homotopy theory 19G38 Hermitian $$K$$-theory, relations with $$K$$-theory of rings
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