Sikora, Adam2015-12-080022-2518http://hdl.handle.net/1885/31577We study multivariable spectral multipliers F (11,12) acting on the Cartesian product of ambient spaces of two self-adjoint operators L\ and I2. We prove that if F satisfies Hdrmander type differentiability condition then the operator F(L],£2) is of CaldKeywords: 2000 mathematics subject classification: 42b15 (43a85,28a80); Analysis on fractals; Spectral multipliersMultivariable Spectral Multipliers and Analysis of Quasielliptic Operators on Fractals200910.1512/iumj.2009.58.37452016-02-24