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In this talk I discuss the theoretical issues associated with latticecalculations of isospin breaking corrections to hadronic matrix elements. Iconcentrate on the calculation of QCD isospin breaking effects for the Kl2 andKl3 decay rates and illustrate the recent lattice results obtained by the RM123collaboration.

Lattice calculation of isospin corrections to Kl2 and Kl3 decays